NFKB1 and Miyoshi myopathy: In a second step, to further determine the subunit composition of the RelA- and RelB-DNA complexes in RelB-positive MM patients, we performed a supershift analysis using antibody directed against each of the five subunits of the NF-κB family i.e. RelA, RelB, p50, p52 and c-Rel (Figure 1C).