Problems of isotope techniques for estimating intestinal flux.
D006801:Humans; D007408:Intestinal Absorption; D007413:Intestinal Mucosa / Q000378:metabolism*; D008722:Methods; D012964:Sodium / Q000097:blood / Q000378:metabolism; D012975:Sodium Isotopes
D012975:Sodium Isotopes; D012964:Sodium