title: Ultrastructural observations on cytodifferentiation of parafollicular cells in the human fetal thyroid.
mesh_terms: D002116:Calcitonin / Q000378:metabolism; D002454:Cell Differentiation; D005260:Female; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D008854:Microscopy, Electron; D011247:Pregnancy; D013961:Thyroid Gland / Q000166:cytology / Q000196:embryology* / Q000378:metabolism
chemical_list: D002116:Calcitonin