when intact e. coli cells are photolyzed at approximately 350 nm in the presence of the photolabile dipeptide , their ability to transport either glycylglycine or unphotolyzed glycyl-4-azido-2-nitro-l-phenylalanine is irreversibly inhibited , but their ability to transport arginine is unaffected .
C0012512
dipeptide
C0017984
glycylglycine