PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25591951-2 2015 Interpolymer interactions between the countercharged polymers like Eudragit EPO (polycation) and hypromellose acetate succinate (polyanion) and Eudragit EPO and hypromellose phthalate (polyanion) were investigated with a view to their use in per oral controlled release drug delivery systems. polyanions 187-196 erythropoietin Homo sapiens 155-158