PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23205906-1 2012 The mRNA guanylyltransferase, or mRNA capping enzyme, cotranscriptionally caps the 5"-end of nascent mRNA with GMP during the second reaction in a set of three enzymatic reactions that result in the formation of an N7-methylguanosine cap during mRNA maturation. 7-methylguanosine 215-233 RNA guanylyltransferase and 5'-phosphatase Mus musculus 4-52