Name	Info	Provider	Link
	subscription/membership/fee required	Atypon	https://journals.asm.org/doi/10.1128/JB.00270-18?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
pilA4	free resource	BioCyc	https://biocyc.org/gene?orgid=GCF_000009725&id=SGL_RS06555
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29844032/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29844032
	free resource	scite Smart Citations	https://scite.ai/reports/29844032