PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
6309805-3	1983	Although these phosphoprotein phosphatases also catalyzed the dephosphorylation of phosphorylase a, glycogen synthase b, and phosphorylated H1 and H2B histones, the phosphatases differed from each other in preferences for substrates and the Mg2+ or Mn2+ requirements for their activities.	magnesium ion	241-245	H2B clustered histone 21	Homo sapiens	147-150