Produced, caused, or derived from a source outside the organism or system; of external origin.
From Greek 'allo-' (other) + 'thogenic' (producing/generated). Similar to allothigenic but used more broadly across sciences. The term reflects how Greek root combinations create precision in technical language.
Allothogenic explains why your body is basically a biological apartment building—your skin cells didn't all come from your original genetic instructions, and about half your body weight is allothogenic bacteria, fungi, and viruses living inside you right now!
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