The War Within

As retrotransposons arise and start jumping around a host genome, the host develops ways to fend them off, sparking a sort of "evolutionary arms race," as researchers led by University of California, Santa Cruz's David Haussler put it.

Haussler and his colleagues report in Nature that they've uncovered two KRAB zinc-finger protein-encoding genes that have evolved in the human genome to deal with the retrotransposon menace.

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