PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23172354-3 2013 At pH 6.5 a monocoordinated complex [Fe(II)(BP1)] was formed instead (K(f) = 2.1 x 10(5) M(-1)) due to electrostatic repulsion between the polyanionic dendrimer branches, as confirmed by the behavior of three analogues where glutamates were partially or completely replaced by neutral glutamines or positive lysines. Glutamates 225-235 BP1 Homo sapiens 44-47