exogenous factor

  Exogenous

In biology, an exogenous factor is any material that is present and active in an individual organism or living cell but that originated outside of that organism, as opposed to an endogenous factor. Exogenous factors in medicine include both pathogens and therapeutics. DNA introduced to cells via transfection or viral infection (transduction) is an exogenous factor. Carcinogens are exogenous factors.

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