TSC2 and tuberous sclerosis: We also performed TSC2-MHPA analysis of 2 additional panels of normal skin biopsies from individuals without TSC: (a) a panel of 10 normal skin biopsies from the inner upper lateral arm (area with reduced sun exposure) (nonTSC-NS) and (b) a panel of 10 biopsies from newborn foreskin (nonTSC-foreskin).