Calcitonin is a hormone
which is released by the thyroid
and parathyroid gland
s when the levels of calcium
compounds in the blood
are too high. The hormone
acts to reduce the levels of calcium
and phosphate circulating in the bloodstream
. It is related to (but distinct from) the hormone thyroxine
A calcitonin molecule is a small peptide composed of thirty-two amino acids.
Some of the information in this writeup was taken from the science dictionary at http://biotech.icmb.utexas.edu/; I oversaw the development of the dictionary (the website was mothballed in 1998) and believe I wrote the entry this writeup is partly or wholly based upon.