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- EMDB-70071: CryoEM structure of mu-opioid receptor - Gi protein complex bound... -

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Basic information

Entry
Database: EMDB / ID: EMD-70071
TitleCryoEM structure of mu-opioid receptor - Gi protein complex bound to fluornitrazene (FNZ)
Map data
Sample
  • Complex: MOR-Gi heterotrimer complex
    • 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: scFv16
    • Protein or peptide: Mu-type opioid receptor
  • Ligand: N,N-diethyl-2-(2-{[4-(2-fluoroethoxy)phenyl]methyl}-5-nitro-1H-1,3-benzimidazol-1-yl)ethan-1-amine
KeywordsComplex / Receptor / Agonist / MOR / MEMBRANE PROTEIN
Function / homology
Function and homology information


Opioid Signalling / spine apparatus / positive regulation of appetite / sperm ejaculation / Peptide ligand-binding receptors / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion / G-protein activation / adenylate cyclase-inhibiting opioid receptor signaling pathway ...Opioid Signalling / spine apparatus / positive regulation of appetite / sperm ejaculation / Peptide ligand-binding receptors / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion / G-protein activation / adenylate cyclase-inhibiting opioid receptor signaling pathway / negative regulation of luteinizing hormone secretion / G protein-coupled opioid receptor activity / regulation of cellular response to stress / G protein-coupled opioid receptor signaling pathway / G alpha (i) signalling events / negative regulation of nitric oxide biosynthetic process / negative regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / behavioral response to ethanol / regulation of NMDA receptor activity / neuropeptide binding / positive regulation of neurogenesis / eating behavior / negative regulation of cytosolic calcium ion concentration / transmission of nerve impulse / G-protein alpha-subunit binding / social behavior / voltage-gated calcium channel activity / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / T-tubule / G protein-coupled serotonin receptor binding / sensory perception of pain / positive regulation of gluconeogenesis / dendrite membrane / dendrite cytoplasm / cellular response to forskolin / presynaptic modulation of chemical synaptic transmission / regulation of mitotic spindle organization / chemokine-mediated signaling pathway / sarcoplasmic reticulum / Regulation of insulin secretion / neuropeptide signaling pathway / response to prostaglandin E / locomotory behavior / excitatory postsynaptic potential / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / sarcolemma / G protein-coupled receptor binding / response to peptide hormone / G protein-coupled receptor activity / GABA-ergic synapse / G-protein beta/gamma-subunit complex binding / centriolar satellite / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / G beta:gamma signalling through BTK / photoreceptor disc membrane / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / GDP binding / Adrenaline,noradrenaline inhibits insulin secretion / 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 / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / G alpha (12/13) signalling events / Inactivation, recovery and regulation of the phototransduction cascade / G-protein beta-subunit binding / extracellular vesicle / sensory perception of taste / sperm principal piece
Similarity search - Function
Mu opioid receptor / Opioid receptor / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / G-protein, gamma subunit / G-protein gamma subunit domain profile. ...Mu opioid receptor / Opioid receptor / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / 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. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 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
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) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.3 Å
AuthorsRobertson MJ / Skiniotis G
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nature / Year: 2026
Title: A µ-opioid receptor superagonist analgesic with minimal adverse effects.
Authors: Juan L Gomez / Emilya N Ventriglia / Zachary J Frangos / Agnieszka Sulima / Michael J Robertson / Michael D Sacco / Reece C Budinich / Ilinca M Giosan / Tongzhen Xie / Oscar Solis / Anna E ...Authors: Juan L Gomez / Emilya N Ventriglia / Zachary J Frangos / Agnieszka Sulima / Michael J Robertson / Michael D Sacco / Reece C Budinich / Ilinca M Giosan / Tongzhen Xie / Oscar Solis / Anna E Tischer / Jennifer M Bossert / Kiera E Caldwell / Hannah Bonbrest / Amelie Essmann / Zelai M Garçon-Poca / Shinbe Choi / Michael R Noya / Feonil Limiac / Ali Arce / Grant C Glatfelter / Margaret Robinson / Li Chen / Angelina A Mullarkey / Dain R Brademan / Garrett Enten / William Dunne / César Quiroz / Ingrid Schoenborn / Chae Bin Lee / Rana Rais / Daniel P Holt / Robert F Dannals / Lei Shi / Ruth Hüttenhain / Sergi Ferré / Eugene Kiyatkin / Jordi Bonaventura / Yavin Shaham / Venetia Zachariou / Michael H Baumann / Georgios Skiniotis / Kenner C Rice / Michael Michaelides /
Abstract: Developing safe and effective pain medications is an ongoing challenge for human health. Agonists for the µ-opioid receptor (MOR) are essential pain medications, but their high intrinsic efficacy ...Developing safe and effective pain medications is an ongoing challenge for human health. Agonists for the µ-opioid receptor (MOR) are essential pain medications, but their high intrinsic efficacy also induces adverse side effects, including respiratory depression, constipation, tolerance, dependence, withdrawal and addiction. Strategies to limit adverse effects traditionally include developing MOR agonists that have low intrinsic efficacy or that preferentially activate G-protein signalling over β-arrestin signalling. Here we identify a novel MOR agonist with supramaximal intrinsic efficacy and a unique pharmacological profile that produced effective analgesia in rodents with minimal adverse effects. N-desethyl-fluornitrazene (DFNZ) was derived from a class of synthetic benzimidazole opioids called nitazenes. DFNZ has impaired brain penetrance, a unique spatiotemporal MOR cellular signalling profile, and diminished efficacy at the MOR-galanin 1 receptor (GAL1) heteromer. DFNZ does not induce respiratory depression, tolerance or MOR downregulation after repeated exposure. Compared with other MOR agonists, DFNZ has limited effects on dopamine neurotransmission in nucleus accumbens and weaker reinforcing effects in the drug self-administration procedure. These results provide novel insights about MOR and nitazene pharmacology, have important implications for pain and addiction treatment, and challenge the prevailing dogma that high-efficacy MOR agonists cannot constitute safe and effective therapeutic agents.
History
DepositionApr 5, 2025-
Header (metadata) releaseApr 1, 2026-
Map releaseApr 1, 2026-
UpdateMay 13, 2026-
Current statusMay 13, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70071.png

Downloads & links

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Map

FileDownload / File: emd_70071.map.gz / Format: CCP4 / Size: 209.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
0.86 Å/pix.
x 380 pix.
= 326.8 Å		0.86 Å/pix.
x 380 pix.
= 326.8 Å		0.86 Å/pix.
x 380 pix.
= 326.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.86 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 9.890000000000001
Minimum - Maximum-46.000903999999998 - 73.723249999999993
Average (Standard dev.)0.0021159062 (±1.0933447)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions380380380
Spacing380380380
CellA=B=C: 326.80002 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : MOR-Gi heterotrimer complex

EntireName: MOR-Gi heterotrimer complex
Components
  • Complex: MOR-Gi heterotrimer complex
    • 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: scFv16
    • Protein or peptide: Mu-type opioid receptor
  • Ligand: N,N-diethyl-2-(2-{[4-(2-fluoroethoxy)phenyl]methyl}-5-nitro-1H-1,3-benzimidazol-1-yl)ethan-1-amine

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Supramolecule #1: MOR-Gi heterotrimer complex

SupramoleculeName: MOR-Gi heterotrimer complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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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: Trichoplusia ni (cabbage looper)
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: 37.671102 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: PGSSGSELDQ LRQEAEQLKN QIRDARKACA DATLSQITNN IDPVGRIQMR TRRTLRGHLA KIYAMHWGTD SRLLVSASQD GKLIIWDSY TTNKVHAIPL RSSWVMTCAY APSGNYVACG GLDNICSIYN LKTREGNVRV SRELAGHTGY LSCCRFLDDN Q IVTSSGDT ...String:
PGSSGSELDQ LRQEAEQLKN QIRDARKACA DATLSQITNN IDPVGRIQMR TRRTLRGHLA KIYAMHWGTD SRLLVSASQD GKLIIWDSY TTNKVHAIPL RSSWVMTCAY APSGNYVACG GLDNICSIYN LKTREGNVRV SRELAGHTGY LSCCRFLDDN Q IVTSSGDT TCALWDIETG QQTTTFTGHT GDVMSLSLAP DTRLFVSGAC DASAKLWDVR EGMCRQTFTG HESDINAICF FP NGNAFAT GSDDATCRLF DLRADQELMT YSHDNIICGI TSVSFSKSGR LLLAGYDDFN CNVWDALKAD RAGVLAGHDN RVS CLGVTD DGMAVATGSW DSFLKIWN

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: Trichoplusia ni (cabbage looper)
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: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 27.784896 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAAHHHHHH HH

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Macromolecule #5: Mu-type opioid receptor

MacromoleculeName: Mu-type opioid receptor / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 47.910758 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MKTIIALSYI FCLVFADYKD DDDAMGPGNI SDCSDPLAPA SCSPAPGSWL NLSHVDGNQS DPCGPNRTGL GGSHSLCPQT GSPSMVTAI TIMALYSIVC VVGLFGNFLV MYVIVRYTKM KTATNIYIFN LALADALATS TLPFQSVNYL MGTWPFGNIL C KIVISIDY ...String:
MKTIIALSYI FCLVFADYKD DDDAMGPGNI SDCSDPLAPA SCSPAPGSWL NLSHVDGNQS DPCGPNRTGL GGSHSLCPQT GSPSMVTAI TIMALYSIVC VVGLFGNFLV MYVIVRYTKM KTATNIYIFN LALADALATS TLPFQSVNYL MGTWPFGNIL C KIVISIDY YNMFTSIFTL CTMSVDRYIA VCHPVKALDF RTPRNAKIVN VCNWILSSAI GLPVMFMATT KYRQGSIDCT LT FSHPTWY WENLLKICVF IFAFIMPVLI ITVCYGLMIL RLKSVRMLSG SKEKDRNLRR ITRMVLVVVA VFIVCWTPIH IYV IIKALI TIPETTFQTV SWHFCIALGY TNSCLNPVLY AFLDENFKRC FREFCIPTSS TIEQQNSARI RQNTREHPST ANTV DRTNH QLENLEAETA PLPDIHHHHH H

UniProtKB: Mu-type opioid receptor

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Macromolecule #6: N,N-diethyl-2-(2-{[4-(2-fluoroethoxy)phenyl]methyl}-5-nitro-1H-1,...

MacromoleculeName: N,N-diethyl-2-(2-{[4-(2-fluoroethoxy)phenyl]methyl}-5-nitro-1H-1,3-benzimidazol-1-yl)ethan-1-amine
type: ligand / ID: 6 / Number of copies: 1 / Formula: A1B79
Molecular weightTheoretical: 414.473 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
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 56.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 667110
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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