In what form does vitamin B6 exist in plasma?
D000328:Adult; D000818:Animals; D001692:Biological Transport; D055598:Chemical Phenomena; D002621:Chemistry; D004285:Dogs; D004912:Erythrocytes / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000378:metabolism; D008297:Male; D011485:Protein Binding; D011730:Pyridoxal; D011732:Pyridoxal Phosphate / Q000097:blood*; D011736:Pyridoxine / Q000097:blood; D012709:Serum Albumin / Q000378:metabolism
D012709:Serum Albumin; D011730:Pyridoxal; D011732:Pyridoxal Phosphate; D011736:Pyridoxine