Neutrality ν is correlated with recombinational tolerance ρ for lattice proteins. Results are from 10 different structures. Error bars show SD of averages of ν and ρ taken at four values of sequence identity (20%, 40%, 60%, and 80%, as in Fig. 2). For the two lowest-neutrality structures, error bars reflect two and three sequence identities, respectively, because no highly diverged homologs were found.