title: Enterokinase deficiency and vitamin B12 absorption.
mesh_terms: D010450:Endopeptidases / Q000172:deficiency*; D004765:Enteropeptidase / Q000172:deficiency*; D006801:Humans; D007408:Intestinal Absorption; D008286:Malabsorption Syndromes / Q000209:etiology*; D014805:Vitamin B 12 / Q000378:metabolism*
chemical_list: D010450:Endopeptidases; D004765:Enteropeptidase; D014805:Vitamin B 12