For cultured cells from HCs and CIS (but not MS patients), ARG1 associated positively only with TGFB mRNA levels; this supported an ARG‐TGFB inter‐relationship with Treg induction (Table 2).26 However, in PBMCs from MS patients, this link may be impaired because of ARG1 intrinsic changes described above. The gene discussed is ARG1; the disease is in situ carcinoma.