Excess surface charge fraction, , versus the unfolding enthalpy per residue, ΔHunf, near 25°C and pH 7. Data are computed from tables in refs. 36 and 41. The proteins are as follows: 1, myoglobin; 2, β-lactoglobulin; 3, α-lactalbumin; 4, chymotrypsinogen A; 5, α-chymotrypsin; 6, hen egg-white lysozyme; 7, subtilisin BPN; 8, RNase A.