To confirm the elevation of TMPRSS5 in CMT1A samples using an orthogonal assay, we developed an in‐house Imperacer immuno PCR assay using commercial TMPRSS5 antibodies and tested the same CMT1A cohort 1 and control cohort 1 samples shown in Figure S1. Here, TMPRSS5 is linked to Charcot-Marie-Tooth disease type 1A.