| Abstract: | Criteria have been set up for recognizing the trait of interconvertibility of transport System ASC, whereby it operates in a deprotonated form to mediate the transport of zwitterionic amino acids and in a protonated form to transport anionic amino acids. This trait has been detected by each criterion applied, in all the tested occurrences of System ASC, as follows: the Ehrlich ascites tumor cell in suspension; a cultured variant thereof in monolayer; the Chinese hamster ovary cell CHO-K1 in monolayer; the pigeon red blood cell in suspension; and the human red blood cell in suspension. We conclude that this trait is a general feature of System ASC which may we may use provisionally in defining the system. |
