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GLP-1(7–37)-NH2 and α/β-peptide analogues. Each molecule has a free N-terminus and a primary amide at the C-terminus. The single-letter code identifies proteinogenic α residues. Colored circles indicate positions of other types of residues, including the nonproteinogenic α residue Aib (green), β3 homologues of proteingenic α residues (blue), and ring-constrained β residues (tan; X = ACPC, Z = APC).
