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Although studies determining the structure of GLP-1 bound to the N-terminal, extracellular domain of the receptor showed that the residues 13-33 of the GLP-1 peptide analogs form a helical structure (PDB ID 3iol, Underwood et al., 2010), recent EM structures of the whole receptor bound to the GLP-1 protein (PDB ID 6x18, Zhang et al., 2020) shows that the entire GLP-1 peptide forms a long helix as it binds to its receptor
Differential ability to stabilize free GSH may also explain why some studies report results as the ratio of free GSH to GSSG (e.g., [19, 22,23,24,25,26])
(B) GRs of Urophonius brachycentrus, note isodiametric morphology, granules in the cytoplasm and short and acute cytoplasmic extensions