Vitamin D and ultra violet radiation.
D004032:Diet; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood; D012279:Rickets / Q000209:etiology; D012880:Skin Pigmentation / Q000528:radiation effects; D014466:Ultraviolet Rays; D014807:Vitamin D / Q000096:biosynthesis / Q000528:radiation effects*
D006887:Hydroxycholecalciferols; D014807:Vitamin D