glycine , d- or l-serine , l-threonine , l-methionine , l-alanine , and l-valine all individually protected against the inactivation of glycine , l-serine , l-threonine , l-methionine , l-alanine , l-valine , l-proline , and beta-alanine transport , while l-proline , beta-alanine ,
C0001898
l-alanine
C0000392
beta-alanine