Oncogene
In fact, the reverse transcription of the virus RNA into DNA had the effect that the oncogenes become integrated into the chromosomal DNA in the cells. It was then found that oncogene-like material could be detected in different species throughout the animal kingdom, in fact even in simple organisms with only a few cells. Furthermore, it was shown that the gene had a fixed position in the chromosomes of a certain species, and that the gene, when it constituted part of the cellular genetic material, was divided into fragments.