the results suggest that ( 1 ) in the adult thyroid gland the c cell in the usual follicle is an ultimobranchial contribution and ( 2 ) the so-called ultimobranchial follicle is ultimobranchial in origin but that the typical thyroid epithelium in mixed follicles of u cells and typical thyroid epithelium is a ventral contribution .
C0229579
c cell
C0014609
epithelium