tokens: A G22V mutant of M-Ras was constitutively active and its expression in an interleukin-3 ( IL-3 ) - dependent mast cell / megakaryocyte cell line resulted in increased survival in the absence of IL-3 , increased growth in IL-4 , and , at high expression levels , in factor independent growth .
folded_tokens: a g22v mutant of m-ra be constitutively active and its expression in a interleukin-3 ( il-3 ) - dependent mast cell / megakaryocyte cell line result in increase survival in the absence of il-3 , increase growth in il-4 , and , at high expression level , in factor independent growth .