title: A new quantitative relation between internal and external steady-state concentrations in active transport.
mesh_terms: D000042:Absorption; D000596:Amino Acids / Q000378:metabolism; D000613:Aminobutyrates / Q000378:metabolism; D000818:Animals; D001693:Biological Transport, Active; D001921:Brain / Q000378:metabolism; D003517:Cyclopentanes; D006639:Histidine / Q000378:metabolism; D007421:Intestine, Small / Q000378:metabolism; D007700:Kinetics; D008954:Models, Biological; D051381:Rats
chemical_list: D000596:Amino Acids; D000613:Aminobutyrates; D003517:Cyclopentanes; D006639:Histidine