The gene coding for calcitonin was isolated and characterized in a non-mammalian vertebrate, chicken. Sequencing of the 3'-end of this gene revealed after the calcitonin coding exon, an intron followed by an exon coding for a calcitonin gene-related peptide, which displays significant amino acid sequence homology with mammalian CGRPs so far sequenced.
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Minvielle et al. (1986) studied this question.
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