the uptake kinetics of ( 14 ) c-labeled amino acids display three components : ( i ) a saturable high-affinity component with ks-values of 48 mum d-alanine , 12 mum alpha-aminoisobutyric acid ( aib ) , 9 mum l-alanine , 8 mum l-proline , and 6 mum l-serine , respectively ;
C0002520
amino acids
C0001898
alanine