The condition or state of being a heterocaryon; the presence of genetically different nuclei within the same cell or organism.
From heterocaryon + -osis (a condition or state). The suffix -osis creates a noun describing the biological state of heterokaryons.
Heterocaryosis is like a single organism having split personalities at the genetic level—different nuclei can produce different proteins in the same cell, creating a natural experiment that helped scientists understand gene regulation.
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