Occurrence of γ-trace in the calcitonin-producing C-cells of simian thyroid gland and human medullary thyroid carcinoma

Abstract
.gamma.-Trace, a microprotein occurring in neuroendocrine cells, was demonstrated by immunohistochemical technique to be present in the calcitonin-producing C-cells of normal simian thyroid gland and of human medullary thyroid carcinoma. A comparatively high concentration of .gamma.-trace was demonstrated in tissue extract of neoplastic C-cells. The immunoreactive protein found in the extract had a MW and electrophoretic mobility characteristic for .gamma.-trace.