PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 33103417-4 2020 Our studies reveal that substitution of the pyridyl-2-carboxylic acid pendent arms of macropa with pyridyl-2-phosphinic acid arms of macrophosphi gives rise to a dramatic enhancement in the ability to discriminate between light lanthanides, reflected by a binding affinity of macrophosphi for La3+ that is over 5 orders of magnitude higher than that for Gd3+. Lanthanoid Series Elements 228-239 GRDX Homo sapiens 354-357