When the inserted gene is expressed it can repress the translation of the endogenous protein.

Exogenous EPO can often be detected in blood, due to slight differences from the endogenous protein, for example, in features of posttranslational modification.

Co-immunoprecipitation is considered to be the gold standard assay for protein-protein interactions, especially when it is performed with endogenous (not overexpressed and not tagged) proteins.

This method detects interactions among endogenous non-tagged proteins.

And our research was for a neo-protein to replace the faulty endogenous protein and restore a normal metabolism.

Co-immunoprecipitation experiments using affinity purified rabbit antisera confirmed these interactions at the level of the endogenous proteins.

Current evidence suggests that this is primarily because of substantial leakage of endogenous protein into the gastrointestinal tract.

The high molecular weight proteins phosphorylated in this experiment are proteins endogenous to the nuclear extract (lanes 7 and 8).

Biotechnological techniques make it possible to engineer this endogenous protein in mammalian cells.

It is an endogenous antibiotic protein with potent killing activity against Gram-negative bacteria.