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Gene expression profiling and biochemical analysis suggests that hybrids have more efficient protein quality control mechanisms than their inbred parental lines.Studies on the molecular mechanisms of aging suggest that inbreeding and aging share a common loss of protein quality control.To test possible connections, RNA-Seq analysis of various tissues of young inbred mice, young hybrids, and older hybrids was used to demonstrate that cellular aging and inbreeding show common molecular signatures.