PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9020461-7 1997 Adding PMMA particles containing BaSO4 or ZrO2, however, caused an increase in TRAP expression and a highly significant increase in bone resorption. Barium Sulfate 33-38 acid phosphatase 5, tartrate resistant Mus musculus 79-83