Study of the roles of folic acid and vitamin B12 in pregnancy. II.
D005260:Female; D005492:Folic Acid / Q000032:analysis*; D006801:Humans; D011247:Pregnancy / Q000378:metabolism; D014805:Vitamin B 12 / Q000032:analysis*
D005492:Folic Acid; D014805:Vitamin B 12
FOLIC ACID/determination; PREGNANCY/metabolism; VITAMIN B12/determination