PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 33517493-4 2021 In the present study, we have highlighted the role of water molecules in hydrogen-bond optimization, in determining pKa values and protonation states of titratable residues in JH2 domain of JAK2 apo protein. Water 54-59 Janus kinase 2 Homo sapiens 190-194