| Genetic analysis of Raf 1 , Mdm 2 , c Myc , Cdc25a and Cdc25b proto oncogenes in 2 ' , 3 ' dideoxycytidine and 1 , 3 butadiene induced lymphomas in B6C3F1 mice . ^^^ Thus , we investigated whether the Raf 1 , Mdm 2 , c Myc , Cdc25a and Cdc25b proto oncogenes , which are implicated in the ras or p 53 or pRb pathways , are alternative oncogenic target genes . ^^^ |