n.叶酸
Folate leels in study participants were about half those found in Americans. 在美国，由于叶酸具有预防出生缺陷的作用，所以许多食品中均含有叶酸。
Folate is a cofactor for this enzyme, which is part of the pathway of homocysteine metabolism in cells. 叶酸为此酶作用后的产物，同时此酶也是细胞内同型半胱胺酸的部分代谢去路。
