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Comparison of amphibian and human glucagon-like peptide amino acid sequences. The predicted amino acid sequences of Xenopus glucagon, GLP-1A(1–37) and GLP-2, are shown in single letter code, with differences in the human, bullfrog, Amphiuma, and Xenopus GLP-1B(1–32), and Xenopus GLP-1C(1–32). Identities are shown as dots.
