TRIM21 and myositis disease: *Myositis panel include SAE1 (SUMO activating enzyme), NXP2 (Nuclear matrix protein-2), MDA5 (CADM-140), TIF-1 gamma (155 kDa), Mi-2 (nuclear helicase protein), P155/140, PL-12 (alanyl-tRNA synthetase), PL-7 (threonyl-tRNA synthetase), OJ (isoleucyl-tRNA synthetase), EJ (glycyl-tRNA synthetase), SRP (Signal Recognition Particle), Jo-1 (Histidyl-tRNA Synthetase), Ku, Smith/RNP (ENA), PM/Scl 100, SSA-52 (Ro52), SSA-60 (Ro60), Fibrillarin (U3 RNP) antibodies