nh oO b> > | nN O > f o L n O wt ee QO O RO i O 8 I oO I ISOLEUCINE SUBSTITUTION FREQUENC Y (x 10) 18 4 PRESENT AGE (years) ~— 40 90 60
nh oO b> > | nN O > f o L n O wt ee QO O RO i O 8 I oO I ISOLEUCINE SUBSTITUTION FREQUENC Y (x 10) 18 4 PRESENT AGE (years) ~— 40 90 60