Ключевые слова: 3d, atom, atomic, biochemistry, biology, bone, c28h44o, calciferol, carbon, chemical, chemistry, composition, compound, deficiency, ergocalciferol, flat, formula, health, hydrogen, icon, illustration, important, laboratory, medical, medicine, metabolism, model, molecular, molecule, nature, organic, oxygen, pharmaceutical, pharmacy, research, science, signs, skeletal, skin, structure, study, supplement, vitamin, vitamin d, vitamin d2,