An organism or tissue that originates from a different genetic source; something of foreign genetic origin.
From allo- (other, different) + -gene (from Greek genesis, origin, birth). Term used in genetics and medicine to describe cells or organisms from genetically distinct sources.
In transplant medicine, an allogene is tissue from someone genetically different from you—like a heart from a donor—which is why your immune system might attack it, making rejection a major challenge in transplantation.
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