Name	Info	Provider	Link
udh	free resource	BioCyc	https://metacyc.org/gene?orgid=META&id=G-11981
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0021-9258(20)50335-9
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21676870/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21676870