PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8357536-7 1993 The histidines beta 2 and beta 143 of the two beta-chains form hydrogen bonds with the phosphates. Histidine 4-14 potassium calcium-activated channel subfamily M regulatory beta subunit 2 Homo sapiens 15-21