rat sarcoma in a sentence

1. Serine dehydratase has also been found to be absent in human colon carcinoma and rat sarcoma.
2. Neopluramycin inhibits growth of Gram-positive bacteria, leukemia L-1210 in mice and Yoshida rat sarcoma cells in tissue culture.
3. Iwasaki and co-workers failed to find mutations of the epidermal growth factor receptor ( EGFR ) or the cellular Kirsten rat sarcoma virus oncogene " K-ras " in one reported case.
4. It's difficult to find rat sarcoma in a sentence.