Originating from a different genetic source or organism, especially in medical transplantation where tissue comes from another individual of the same species.
From Greek 'allo-' (other) + '-genic' (producing, generating), coined in the 20th century to describe biological material from genetically different sources within the same species.
This word is crucial in modern medicine because allogenic transplants are how we save lives with donor organs and tissues—but the catch is your immune system might reject them because it recognizes them as 'foreign,' which is why transplant recipients need special drugs.
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