with the use of a direct-binding liquid competition radioimmunoassay ( ria ) , capable of providing truly quantitative analysis of the 21,000-dalton ( p21 ) ras oncogene and protooncogene products , absolute levels of ha-ras p21 have been determined in human breast and colon carcinomas , benign lesions , and/or their respective normal tissues .
C0034678
ras
C0086418
human