Status	Description	Organism	Genes	References
	carboxyethyl-arginine beta-lactam-synthase	Anoxybacillus flavithermus	bls
	LexA repressor	Brucella ceti	lexA
	LexA repressor	Brucella melitensis	lexA
	β-lactam synthetase	Salinispora pacifica	G16BO-1308
	carboxyethyl-arginine beta-lactam-synthase	Streptomyces avellaneus	G16WU-5764
	putative beta-lactam synthetase	Streptomyces cattleya	GJCM-6806
	asparagine synthase (glutamine-hydrolyzing)	Saccharomonospora viridis	GHAV-3256