Batman and Robin. Sherlock Holmes and Dr. Watson. Fiction is full of dynamic duos that work together to accomplish amazing feats. When one partner is out of commission, the other steps in to make sure the job gets done. But if both are missing in action, the outcome is likely to be dire. Cancers also often rely on pairs of complementary genes to keep their cells plugging along as they spin increasingly out of the bounds of normal cellular control.
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