They come into existence when the cell is formed by division and simply replicate the pre-existing genes already present in the TKT cells .
But the genes which express EPO in cells by the TKT process are not exogenous .
TKT come into existence when the cell is formed by division and simply replicate the pre-existing genes already present in the TKT cells .
But the genes which express EPO in cells by the TKT process are not exogenous .