title: [On early stages of embryology].
mesh_terms: D000311:Adrenal Glands / Q000502:physiology*; D000818:Animals; D002454:Cell Differentiation; D000013:Congenital Abnormalities / Q000209:etiology; D004622:Embryo, Mammalian / Q000033:anatomy & histology; D004626:Embryology; D005260:Female; D006801:Humans; D007515:Islets of Langerhans / Q000502:physiology*; D010280:Parathyroid Glands / Q000502:physiology; D010902:Pituitary Gland / Q000502:physiology; D011247:Pregnancy; D013961:Thyroid Gland / Q000502:physiology*; D013997:Time Factors