Transfection of brown leghorn chicken embryo fibroblasts by DNA containing v-myb sequences cloned either in a complete AMV proviral DNA or in a retroviral derived vector has led to the isolation of two kinds of transformed cells. A characterization of the proviral sequences retained and expressed in these transformed cells revealed that they contained either new or altered v-myb-related RNA species. The experiments presented in this paper also show that both types of transformants expressed truncated myb-related polypeptides, suggesting that alterations of the v-myb product may result in a new target specificity, leading to the transformation of chicken embryo fibroblasts.
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