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Biosynthetic precursors were identified from skin secretion of the amphibian family, Hylidae. The species and their access numbers are shown before the alignments of each precursor. The classic prepropeptide convertase processing sites –KR– are shown in bold typeface. The putative acidic amino acid residues rich peptides were located between two –KR– in each case. The regions with a single underline indicate highly conserved sequences as compared to conventional BK.
