But the genes which express EPO in cells by the TKT process are not exogenous .
Interpreting the claims of the Amgen patent in the context of its specification , the claims are concerned with the expression of EPO by a gene which is exogenous to the cell .
The genes which express EPO in cells by the TKT process are not exogenous .
Interpreting the claims of the Amgen patent in the context of its specification , the claims are concerned with the expression of EPO by a gene which is exogenous to the cell .