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- EMDB-45738: Cryo-EM structure of Gq-coupled FFA2 in complex with TUG-1375 and... -

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Basic information

Entry
Database: EMDB / ID: EMD-45738
TitleCryo-EM structure of Gq-coupled FFA2 in complex with TUG-1375 and compound 187
Map data
Sample
  • Complex: TUG-1375-compound 187-FFA2-miniGq complex
    • Protein or peptide: Guanine nucleotide-binding protein G(q) subunit alpha
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: scFv16
    • Protein or peptide: Free fatty acid receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: (2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phenyl]carbonyl-1,3-thiazolidine-4-carboxylic acid
  • Ligand: 4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-7-(2-fluorobenzene-1-sulfonyl)-2-methyl-5H-pyrrolo[3,2-d]pyrimidin-6-amine
  • Ligand: CHOLESTEROL
  • Ligand: PALMITIC ACID
KeywordsGPCR / agonist / MEMBRANE PROTEIN
Function / homology
Function and homology information


positive regulation of acute inflammatory response to non-antigenic stimulus / regulation of peptide hormone secretion / regulation of acute inflammatory response / mucosal immune response / leukocyte chemotaxis involved in inflammatory response / Free fatty acid receptors / positive regulation of cytokine production involved in immune response / cell surface pattern recognition receptor signaling pathway / lipid storage / cellular response to fatty acid ...positive regulation of acute inflammatory response to non-antigenic stimulus / regulation of peptide hormone secretion / regulation of acute inflammatory response / mucosal immune response / leukocyte chemotaxis involved in inflammatory response / Free fatty acid receptors / positive regulation of cytokine production involved in immune response / cell surface pattern recognition receptor signaling pathway / lipid storage / cellular response to fatty acid / fat cell differentiation / ligand-gated ion channel signaling pathway / positive regulation of chemokine production / positive regulation of interleukin-8 production / cell projection / negative regulation of insulin secretion / G protein-coupled receptor activity / positive regulation of insulin secretion / 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 / 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 / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / glucose homeostasis / 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 / GTPase binding / Ca2+ pathway / fibroblast proliferation / 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 / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / lipid binding / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
G protein-coupled receptor 40-related receptor / 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-coupled receptor 40-related receptor / 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
Similarity search - Domain/homology
Free fatty acid receptor 2 / 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
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.06 Å
AuthorsZhang X / Tikhonova I / Milligan G / Zhang C
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM128641 United States
CitationJournal: Nature / Year: 2025
Title: Allosteric modulation and biased signalling at free fatty acid receptor 2.
Authors: Xuan Zhang / Abdul-Akim Guseinov / Laura Jenkins / Alice Valentini / Sara Marsango / Katrine Schultz-Knudsen / Trond Ulven / Elisabeth Rexen Ulven / Irina G Tikhonova / Graeme Milligan / Cheng Zhang /
Abstract: Free fatty acid receptor 2 (FFA2) is a G protein-coupled receptor (GPCR) that is a primary sensor for short-chain fatty acids produced by gut microbiota. Consequently, FFA2 is a promising drug ...Free fatty acid receptor 2 (FFA2) is a G protein-coupled receptor (GPCR) that is a primary sensor for short-chain fatty acids produced by gut microbiota. Consequently, FFA2 is a promising drug target for immunometabolic disorders. Here we report cryogenic electronic microscopy structures of FFA2 in complex with two G proteins and three distinct classes of positive allosteric modulators (PAMs), and describe noncanonical activation mechanisms that involve conserved structural features of class A GPCRs. Two PAMs disrupt the E/DRY activation microswitch and stabilize the conformation of intracellular loop 2 by binding to lipid-facing pockets near the cytoplasmic side of the receptor. By contrast, the third PAM promotes the separation of transmembrane helices 6 and 7 by interacting with transmembrane helix 6 at the receptor-lipid interface. Molecular dynamic simulations and mutagenesis experiments confirm these noncanonical activation mechanisms. Furthermore, we demonstrate the molecular basis for the G versus G bias, which is due to distinct conformations of intracellular loop 2 stabilized by different PAMs. These findings provide a framework for the design of tailored GPCR modulators, with implications that extend beyond FFA2 to the broader field of GPCR drug discovery.
History
DepositionJul 12, 2024-
Header (metadata) releaseJun 25, 2025-
Map releaseJun 25, 2025-
UpdateAug 13, 2025-
Current statusAug 13, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45738.png

Downloads & links

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Map

FileDownload / File: emd_45738.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.72 Å/pix.
x 256 pix.
= 184.32 Å		0.72 Å/pix.
x 256 pix.
= 184.32 Å		0.72 Å/pix.
x 256 pix.
= 184.32 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.72 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.137
Minimum - Maximum-1.1026335 - 1.6072733
Average (Standard dev.)0.001432863 (±0.048236206)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 184.32 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_45738_half_map_1.map
Projections & Slices
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Density Histograms

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Half map: #1

Fileemd_45738_half_map_2.map
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Sample components

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Entire : TUG-1375-compound 187-FFA2-miniGq complex

EntireName: TUG-1375-compound 187-FFA2-miniGq complex
Components
  • Complex: TUG-1375-compound 187-FFA2-miniGq complex
    • Protein or peptide: Guanine nucleotide-binding protein G(q) subunit alpha
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: scFv16
    • Protein or peptide: Free fatty acid receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: (2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phenyl]carbonyl-1,3-thiazolidine-4-carboxylic acid
  • Ligand: 4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-7-(2-fluorobenzene-1-sulfonyl)-2-methyl-5H-pyrrolo[3,2-d]pyrimidin-6-amine
  • Ligand: CHOLESTEROL
  • Ligand: PALMITIC ACID

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Supramolecule #1: TUG-1375-compound 187-FFA2-miniGq complex

SupramoleculeName: TUG-1375-compound 187-FFA2-miniGq 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(q) subunit alpha

MacromoleculeName: Guanine nucleotide-binding protein G(q) subunit alpha / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 28.084832 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGSTVSAEDK AAAERSKMID KNLREDGEKA RRTLRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA ...String:
MGSTVSAEDK AAAERSKMID KNLREDGEKA RRTLRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA RYTTPEDATP EPGEDPRVTR AKYFIRKEFV DISTASGDGR HICYPHFTCA VDTENARRIF NDCKDIILQM NL REYNLV

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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: 40.845559 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV ...String:
MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV TSSGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD IN AICFFPN GNAFATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAG HDNRVS CLGVTDDGMA VATGSWDSFL KIWNGSSGGG GSGGGGSSGV SGWRLFKKIS

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

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Macromolecule #3: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 28.634797 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL LEENLYFQGA SHHHHHHHH

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Macromolecule #4: Free fatty acid receptor 2

MacromoleculeName: Free fatty acid receptor 2 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 61.023004 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DYKDDDDGQP GNGSAFLLAP NGSHAPDHNV TQQRDEENLY FQGVDMLPDW KSSLILMAYI IIFLTGLPAN LLALRAFVGR IRQPQPAPV HILLLSLTLA DLLLLLLLPF KIIEAASNFR WYLPKVVCAL TSFGFYSSIY CSTWLLAGIS IERYLGVAFP V QYKLSRRP ...String:
DYKDDDDGQP GNGSAFLLAP NGSHAPDHNV TQQRDEENLY FQGVDMLPDW KSSLILMAYI IIFLTGLPAN LLALRAFVGR IRQPQPAPV HILLLSLTLA DLLLLLLLPF KIIEAASNFR WYLPKVVCAL TSFGFYSSIY CSTWLLAGIS IERYLGVAFP V QYKLSRRP LYGVIAALVA WVMSFGHCTI VIIVQYLNTT EQVRSGNEIT CYENFTDNQL DVVLPVRLEL CLVLFFIPMA VT IFCYWRF VWIMLSQPLV GAQRRRRAVG LAVVTLLNFL VCFGPYNVSH LVGYHQRKSP WWRSIAVVFS SLNASLDPLL FYF SSSVVR RAFGRGLQVL RNQGSSLLGR RGKDTAEGTN EDRGVGQGEG MPSSDFTTEA AAVFTLEDFV GDWEQTAAYN LDQV LEQGG VSSLLQNLAV SVTPIQRIVR SGENALKIDI HVIIPYEGLS ADQMAQIEEV FKVVYPVDDH HFKVILPYGT LVIDG VTPN MLNYFGRPYE GIAVFDGKKI TVTGTLWNGN KIIDERLITP DGSMLFRVTI NSHHHHHHHH

UniProtKB: Free fatty acid receptor 2

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Macromolecule #5: 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: 5 / 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 #6: (2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phe...

MacromoleculeName: (2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phenyl]carbonyl-1,3-thiazolidine-4-carboxylic acid
type: ligand / ID: 6 / Number of copies: 1 / Formula: 9UJ
Molecular weightTheoretical: 442.915 Da
Chemical component information

ChemComp-9UJ:
(2R,4R)-2-(2-chlorophenyl)-3-[4-(3,5-dimethyl-1,2-oxazol-4-yl)phenyl]carbonyl-1,3-thiazolidine-4-carboxylic acid

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Macromolecule #7: 4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-7-(2-fluorobenzene-1-sulfo...

MacromoleculeName: 4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-7-(2-fluorobenzene-1-sulfonyl)-2-methyl-5H-pyrrolo[3,2-d]pyrimidin-6-amine
type: ligand / ID: 7 / Number of copies: 1 / Formula: A1AZC
Molecular weightTheoretical: 419.473 Da

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Macromolecule #8: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 8 / Number of copies: 1 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #9: PALMITIC ACID

MacromoleculeName: PALMITIC ACID / type: ligand / ID: 9 / Number of copies: 1 / Formula: PLM
Molecular weightTheoretical: 256.424 Da
Chemical component information

ChemComp-PLM:
PALMITIC ACID

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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: FEI FALCON IV (4k x 4k) / Average electron dose: 55.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 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: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.06 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 348210
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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