PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25502369-4 2015 By creating a bi-allelic glutamine synthetase knock out of the original CHOK1SV host cell line, they were able to improve the efficiency of generating high producing stable CHO lines for drug product manufacturing. CAV protocol 72-75 glutamine synthetase Cricetulus griseus 25-45