the uptake of lysine into the epithelium from the vascular bed was accelerated by l-ornithine and slightly by l-arginine when they were present in the lumen , while l-leucine , l-alanine , beta-alanine , l-proline , l-citrulline , sarcosine , l-histidine and aib had no effect .
C0001898
l-alanine
C0000392
beta-alanine