nine other neutral amino acids ( l-alanine , l-serine , l-cysteine , glycine , l-proline , l-homoserine , l-leucine , l-phenylalanine and l-glutamine ) , and an acidic amino acid ( l-aspartate ) were also tested at 10 mm and , although several caused inhibition , the ki was always at least 20 times higher than the measured km for l-lysine .
C0301715
neutral amino acids
C0036720
l-serine