analysis of tpa-treated el-4 cells with antiserum raised against a synthetic peptide predicted by the mmtv ltr open reading frame sequence detected a polypeptide migrating in gels with an apparent molecular weight of 37,000 mr , as well as three less prominent proteins with apparent molecular weights of 31,000 , 34,000 , and 39,000 .
C0007634
cells
C0079941
open reading frame