tokens: Transformation of chicken embryo fibroblasts ( CEF ) with the Gag - Crk fusion protein results in the elevation of tyrosine phosphorylation on specific cellular proteins with molecular weights of 130 , 000 , 110 , 000 , and 70 , 000 ( p130 , p110 , and p70 , respectively ) , an event which has been correlated with cell transformation .