PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23836816-10 2013 We conclude that surface tethering of TbpB is required for optimal performance of the transferrin iron acquisition system, while the presence of the polyglycine stretch near the amino terminus of TbpB contributes significantly to transferrin iron transport function. polyglycine 149-160 transferrin Homo sapiens 230-241