. "\"The chemical reactions and pathways resulting in the formation of vitamin D, any of a group of related, fat-soluble compounds that are derived from delta-5,7 steroids and play a central role in calcium metabolism. Specific forms of vitamin D include calciferol (ergocalciferol; vitamin D2) and cholecalciferol (calciol; vitamin D3).\" [CHEBI:27300, GOC:mah, ISBN:0471331309]" . . "vitamin D biosynthetic process" . "vitamin D anabolism" . "vitamin D biosynthesis" . "vitamin D formation" . "vitamin D synthesis" . . . . . "calciferol biosynthesis" . "calciferol biosynthetic process" . "cholecalciferol biosynthesis" . "cholecalciferol biosynthetic process" . "ergocalciferol biosynthesis" . "ergocalciferol biosynthetic process" .