PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 6048324-2 1967 The control of Ca2 plus and PO4-3 minus exchange by univalent CATION Ca2 plus substitution at the hydroxyapatite crystal surface. po4 28-31 carbonic anhydrase 2 Homo sapiens 69-72 23274254-0 2013 A vibrational spectroscopic study of the phosphate mineral zanazziite - Ca2(MgFe2+)(MgFe2+Al)4Be4(PO4)6.6(H2O). po4 98-101 carbonic anhydrase 2 Homo sapiens 72-75