FURTHER EVIDENCE FOR A PARATHYROID HORMONE‐RELATED PROTEIN IN FETAL PARATHYROID GLANDS OF SHEEP

Abstract
Extracts of ovine fetal parathyroid glands contained a substance in addition to parathyroid hormone (PTH) which could not be neutralized by antiserum against PTH in a cytochemical bioassay. This substance reacted similarly to human parathyroid hormone-related protein, the humoral hypercalcaemic factor associated with malignancy in man. The ovine fetal PTHrP may be responsible for maintaining the fetus hypercalcaemic relative to the mother.