TRIM21 and myositis disease: Conversely, in presence of evocative EMG/ENG and/or musculoskeletal MR, the algorithm gives an indication for assays of anti-SRP, anti-HMGCR Ab and the autoimmune panel (including the extended Myositis panel anti-Mi2/alpha and beta, anti-DNA, Ku, SRP, PL7, PL-12, EJ, OJ, Jo 1, PM-Scl100 and PM-Sc75, Ro-52, NXP2, TIF 1g, SAE1 and MDA5).