the first channel is a general transport system with the following relative affinities for the amino acids : methionine 75 , alanine 75 , phenylalanine 64 , tyrosine 64 , leucine 63 , cysteine 58 , serine 57 , glycine 56 , tryptophan 54 , glutamine 51 , threonine 49 , valine 44 , isoleucine 44 , glutamic acid 44 , proline 43 , histidine 33 , lysine 32 , asparagine 22 , arginine 22 , aspartic acid 18 .
C0002520
amino acids
C0017890
glycine