CALCA GI:76880478 calcitonin isoform CGRP preproprotein 1 mgfqkfspfl alsilvllqa gslhaapfrs alesspadpa tlsedearll 50 51 laalvqdyvq mkaseleqeq eregsriiaq kracdtatcv thrlagllsr 100 101 sggvvknnfv ptnvgskafg rrrrdlqa