UCHL1 and tuberous sclerosis: Like GFAP, UCH-L1 levels in plasma were similar in the TSC (median 58.4, range 0.02–338.8 pg/mL), Ctrl-T (median 70.3, range 3.9–391.5 pg/mL), and Ctrl-R (median 73.0, range 12.1–229.5 pg/mL) groups (Fig. 4e).