since an amphipathic alpha-helical conformation on the calcitonin molecule is associated with high potency in lowering serum calcium , the activity of the parent peptide was compared to that of [ gly8 , d-arg24 ] des-leu16-salmon calcitonin , a calcitonin analogue ( cta ) with less helix forming potential .
C0073994
salmon calcitonin
C0006668
calcitonin