PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8384557-3 1993 Its substrate specificity and sensitivity to the inhibitors, okadaic acid and microcystin, were similar (but not identical) to the catalytic subunit of PP2A. microcystin 78-89 protein phosphatase 2 phosphatase activator Homo sapiens 152-156