proparathyroid hormone

pro·par·a·thy·roid hor·mone

the immediate precursor of parathyroid hormone; proparathyroid differs from parathyroid hormone by an N-terminal hexapeptide extension.

pro·par·a·thy·roid hor·mone

(prō-par'ă-thī'royd hōr'mōn)
The immediate precursor of parathyroid hormone.

proparathyroid hormone

an intermediate precursor of parathyroid hormone, formed from pre-proparathyroid hormone in the rough endoplasmic reticulum of chief cells; abbreviated proPTH.