despite the depletion of both their content of exchangeable endogenous amino acids and reserves of atp , starved hypo-osmotically shocked preparations of the tumour cells accumulated relatively large amounts of ( 14 ) c-labelled 2-aminoisobutyrate , l-alanine , glycine , l-leucine , l-methionine , l-phenylalanine and l-serine , against their respective concentration gradients , by a process apparently driven by the spontaneous flow of na ( + ) ions into the cellular phase .
C0002520
amino
C0001898
l-alanine