Name Info Provider Link
subscription/membership/fee required Atypon https://journals.asm.org/doi/10.1128/JB.185.19.5747-5754.2003?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
tonB free resource BioCyc https://biocyc.org/gene?orgid=ECOLI&id=EG11012
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/13129945/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/13129945