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- EMDB-72008: Primed-state loperamide-mu opioid receptor-Gi GDPbS complex (rebound) -

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Basic information

Entry
Database: EMDB / ID: EMD-72008
TitlePrimed-state loperamide-mu opioid receptor-Gi GDPbS complex (rebound)
Map data
Sample
  • Complex: Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Cytochrome b-562/Mu-type opioid receptor chimera protein,Mu-type opioid receptor
  • Ligand: 5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine
  • Ligand: CHOLESTEROL
  • Ligand: 4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide
KeywordsG protein coupled receptor / Mu Opioid receptor / Loperamide / MEMBRANE PROTEIN / GDP
Function / homology
Function and homology information


Opioid Signalling / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion / regulation of cellular response to stress / G protein-coupled opioid receptor signaling pathway / behavioral response to ethanol / negative regulation of nitric oxide biosynthetic process / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / sensory perception ...Opioid Signalling / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion / regulation of cellular response to stress / G protein-coupled opioid receptor signaling pathway / behavioral response to ethanol / negative regulation of nitric oxide biosynthetic process / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / sensory perception / regulation of NMDA receptor activity / neuropeptide binding / positive regulation of neurogenesis / negative regulation of cytosolic calcium ion concentration / G-protein alpha-subunit binding / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / adenylate cyclase inhibitor activity / voltage-gated calcium channel activity / MECP2 regulates neuronal receptors and channels / positive regulation of protein localization to cell cortex / T cell migration / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / response to prostaglandin E / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / sensory perception of pain / cellular response to forskolin / regulation of mitotic spindle organization / Peptide ligand-binding receptors / Regulation of insulin secretion / positive regulation of cholesterol biosynthetic process / electron transport chain / negative regulation of insulin secretion / G protein-coupled receptor binding / response to peptide hormone / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / centriolar satellite / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / GDP binding / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / G-protein beta-subunit binding / cellular response to prostaglandin E stimulus / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / G protein activity / GTPase binding / Ca2+ pathway / fibroblast proliferation / Interleukin-4 and Interleukin-13 signaling / midbody / cell cortex / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / perikaryon / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Ras protein signal transduction / electron transfer activity / periplasmic space
Similarity search - Function
Mu opioid receptor / Opioid receptor / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. ...Mu opioid receptor / Opioid receptor / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Soluble cytochrome b562 / Mu-type opioid receptor / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.78 Å
AuthorsGati C / Han GW / Khan S
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM144965 United States
National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)AT012075 United States
CitationJournal: Nature / Year: 2025
Title: Structural snapshots capture nucleotide release at the μ-opioid receptor.
Authors: Saif Khan / Aaliyah S Tyson / Mohsen Ranjbar / Zixin Zhang / Jaskaran Singh / Gye Won Han / Cornelius Gati /
Abstract: As a member of the G protein-coupled receptor superfamily, the μ-opioid receptor (MOR) activates heterotrimeric G proteins by opening the Gα α-helical domain (AHD) to enable GDP-GTP exchange, ...As a member of the G protein-coupled receptor superfamily, the μ-opioid receptor (MOR) activates heterotrimeric G proteins by opening the Gα α-helical domain (AHD) to enable GDP-GTP exchange, with GDP release representing the rate-limiting step. Here, using pharmacological assays, we show that agonist efficacy correlates with decreased GDP affinity, promoting GTP exchange, whereas antagonists increase GDP affinity, dampening activation. Further investigating this phenomenon, we provide 8 unique structural models and 16 cryogenic electron microscopy maps of MOR with naloxone or loperamide, capturing several intermediate conformations along the activation pathway. These include four GDP-bound states with previously undescribed receptor-G protein interfaces, AHD arrangements and transitions in the nucleotide-binding pocket required for GDP release. Naloxone stalls MOR in a 'latent' state, whereas loperamide promotes an 'engaged' state, which is structurally poised for opening of the AHD domain and subsequent GDP release. These findings, supported by molecular dynamics simulations, identify GDP-bound intermediates and AHD conformations as key determinants of nucleotide exchange rates, providing structural and mechanistic insights into G protein activation and ligand efficacy with broad implications for G protein-coupled receptor pharmacology.
History
DepositionAug 6, 2025-
Header (metadata) releaseNov 12, 2025-
Map releaseNov 12, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_72008.png

Downloads & links

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Map

FileDownload / File: emd_72008.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.29 Å/pix.
x 256 pix.
= 331.264 Å		1.29 Å/pix.
x 256 pix.
= 331.264 Å		1.29 Å/pix.
x 256 pix.
= 331.264 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.294 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.212
Minimum - Maximum-1.712409 - 3.6581569
Average (Standard dev.)0.014010878 (±0.051958017)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 331.264 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2

EntireName: Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2
Components
  • Complex: Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Cytochrome b-562/Mu-type opioid receptor chimera protein,Mu-type opioid receptor
  • Ligand: 5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine
  • Ligand: CHOLESTEROL
  • Ligand: 4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide

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Supramolecule #1: Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2

SupramoleculeName: Loperamide-mu opioid receptor in complex with Gai-GDPbS, Gb1 and Gg2
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 130 kDa/nm

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Macromolecule #1: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.415031 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGGQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHESM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCA TDTKNVQFVF DAVTDVIIKN NLKDCGLF

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.839469 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: HHHHHHHHHH LEVLFQGPGS SGSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSR LLVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE L AGHTGYLS ...String:
HHHHHHHHHH LEVLFQGPGS SGSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSR LLVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE L AGHTGYLS CCRFLDDNQI VTSSGDTTCA LWDIETGQQT TTFTGHTGDV MSLSLAPDTR LFVSGACDAS AKLWDVREGM CR QTFTGHE SDINAICFFP NGNAFATGSD DATCRLFDLR ADQELMTYSH DNIICGITSV SFSKSGRLLL AGYDDFNCNV WDA LKADRA GVLAGHDNRV SCLGVTDDGM AVATGSWDSF LKIWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #4: Cytochrome b-562/Mu-type opioid receptor chimera protein,Mu-type ...

MacromoleculeName: Cytochrome b-562/Mu-type opioid receptor chimera protein,Mu-type opioid receptor
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 69.540367 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MKTIIALSYI FCLVFADYKD HDGDYKDHDI DYKDDDDKLH HHHHHHHHHL EVLFQGPGSG SADLEDNWET LNDNLKVIEK ADNAAQVKD ALTKMRAAAL DAQKATPPKL EDKSPDSPEM KDFRHGFDIL VGQIDDALKL ANEGKVKEAQ AAAEQLKTTR N AYIQKYLG ...String:
MKTIIALSYI FCLVFADYKD HDGDYKDHDI DYKDDDDKLH HHHHHHHHHL EVLFQGPGSG SADLEDNWET LNDNLKVIEK ADNAAQVKD ALTKMRAAAL DAQKATPPKL EDKSPDSPEM KDFRHGFDIL VGQIDDALKL ANEGKVKEAQ AAAEQLKTTR N AYIQKYLG TGSDSSAAPT NASNCTDALA YSSCSPAPSP GSWVNLSHLD GNLSDPCGPN RTDLGGRDSL CPPTGSPSMI TA ITIMALY SIVCVVGLFG NFLVMYVIVR YTKMKTATNI YIFNLALADA LATSTLPFQS VNYLMGTWPF GTILCKIVIS IDY YNMFTS IFTLCTMSVD RYIAVCHPVK ALDFRTPRNA KIINVCNWIL SSAIGLPVMF MATTKYRQGS IDCTLTFSHP TWYW ENLLK ICVFIFAFIM PVLIITVCYG LMILRLKSVR MLSGSKEKDR NLRRITRMVL VVVAVFIVCW TPIHIYVIIK ALVTI PETT FQTVSWHFCI ALGYTNSCLN PVLYAFLDEN FKRCFREFCI PTSSNIEQQN STRIRQNTRD HPSTANTVDR TNHQLE NLE AETAPLPAAA LEVLFQGPGS WSHPQFEKGG GSGGGSGGSS AWSHPQFEKH HHHHHHHHH

UniProtKB: Soluble cytochrome b562, Mu-type opioid receptor

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Macromolecule #5: 5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine

MacromoleculeName: 5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine
type: ligand / ID: 5 / Number of copies: 1 / Formula: VSN
Molecular weightTheoretical: 459.266 Da
Chemical component information

ChemComp-VSN:
5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine

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Macromolecule #6: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 6 / Number of copies: 2 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #7: 4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]-N,N-dimethyl-2,2-d...

MacromoleculeName: 4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide
type: ligand / ID: 7 / Number of copies: 1 / Formula: A1CMV
Molecular weightTheoretical: 477.038 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
Component:
ConcentrationFormulaName
40.0 mMHEPESHEPES
100.0 mMNaClsodium chloride
0.00075 %LMNGdetergent
0.00025 %GDNdetergent
GridModel: UltrAuFoil R1.2/1.3 / Support film - Material: GOLD / Support film - topology: HOLEY ARRAY
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Average electron dose: 51.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.5 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC (ver. v4.3.1) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL / In silico model: Ab initio
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.78 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. v4.3.1) / Number images used: 292261
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. v4.3.1)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. v4.3.1)
Final 3D classificationNumber classes: 2 / Software - Name: cryoSPARC (ver. v4.3.1)

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