PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18560355-3 2008 Herein, we examined urethane-induced lung tumorigenesis in a new mouse model developed by replacing the Kras gene with an Hras gene in the susceptible A/J-type Pas1 locus and crossing these mice with either C57BL/6J or A/J mice. Urethane 20-28 Harvey rat sarcoma virus oncogene Mus musculus 122-126