Serum folic acid activity of Southern Nigerian blood donors.
D044383:Black People; D001782:Blood Donors; D005260:Female; D005492:Folic Acid / Q000097:blood*; D005494:Folic Acid Deficiency / Q000097:blood*; D006801:Humans; D008297:Male; D009549:Nigeria; D012621:Seasons; D044465:White People
D005492:Folic Acid