Name	Info	Provider	Link
	subscription/membership/fee required	American Chemical Society	https://doi.org/10.1021/bi0607498
purA	free resource	BioCyc	https://biocyc.org/gene?orgid=ECOLI&id=EG10790
Gene Ontology annotations from this paper	free resource	Gene Ontology	http://amigo.geneontology.org/amigo/reference/PMID:16981730
	free resource	GlyGen glycoinformatics resource	https://glygen.org/publication/PubMed/16981730/
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/16981730/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/16981730