PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3421938-1 1988 Osteonectin, extracted from foetal porcine calvariae with 0.5 M-EDTA, was purified to homogeneity by using gel filtration and polyanion anion-exchange fast protein liquid chromatography under dissociative conditions without the need of reducing agents. polyanions 126-135 secreted protein acidic and cysteine rich Bos taurus 0-11