A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, that gives rise to a more stable or definitive product.
生化物质，如一连串酶反应中的中间化合物，可形成更稳定或明确的结果。
2
As an intermediate product from protein to amino acid, peptide is the important nutrient substance and one of the important alimentation of protein besides amino acid.