Calcitonin causes a rapid but short-lived drop in the level of calcium and phosphate in blood by promoting their assimilation in bones.Eel: H-Cys-Ser-Asn-Leu-Ser-Thr-Cys-Val-Leu-Gly-Lys-Leu-Ser-Gln-Glu-Leu-His-Lys-Leu-Gln-Thr-Tyr-Pro-Arg-Thr-Asp-Val-Gly-Ala-Gly-Thr-Pro-NH2 (Cys1-Cys7) or H-CSNLSTCVLGKLSQELHKLQTYPRTDVGAGTP-NH2 (Cys1-Cys7)