Before revision:  Using a computational model of hypothetical self-replicating autocatalytic heteropolymers, we identify a fundamental symmetry-breaking mechanism that significantly increases the rate of replication of asymmetric heteropolymers, compared to their symmetric counterparts  .
After revision:  Using a computational model of hypothetical self-replicating autocatalytic heteropolymers, we identify a fundamental symmetry-breaking mechanism that significantly increases the rate of replication of asymmetric heteropolymers, compared to their symmetric counterparts in the Darwinian competition for space and common substrates .