Ключевые слова: 3d, biochemistry, biology, cartoon, chemistry, color, dimer, enzyme, gaussian surface, graphic, health, helix, human, illustration, interaction, isolated, ligand, medicine, model, molecule, nicotinamide, nmprtase, phosphoribosyltransferase, protein, quaternary, research, science, secondary, shape, structure, tertiary, transferase, white background,