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It was for renal epithelial transport that the logical conclusion was first reached that different agencies serve for the transport of cationic and zwitterionic amino acids [4]. Such partitions according to molecular charge have usually proved valid for other cells and tissues of the higher animal, given that attention is applied to identify the charge retained by the amino acid during transport, and also that allowance is made for the possibility that the transport system may have its charge changed by protonation or deprotonation (see review on the influence of molecular charge on the route of amino acid transport, ref. [7]). In the early sixties it came to be appreciated that a single agency would not, however, account for the transport of the zwitterionic amino acids, and thereafter the significant discrimination was made between the Na§ and Na+-independent agencies [17]. Each of these two transport systems showed other important distinguishing characteristics, for example, the extent to which inward transport was quickly offset by outward transport [17]. Furthermore, other limited tests suggested homogeneity of each of these two components in the Ehrlich cell. Already by the time we reported that result, it could be sensed that the Na§ component probably represented more than one system--note the change in title in going from our preliminary [161 to our final [17] report. An important feature of the latter report was the finding that parallel transport by two or more systems tended to be characteristic for any amino acid because of the heavy overlap in their amino acid selectivity. This discovery led ultimately to

On the strategy of kinetic discrimination of amino acid transport systems