MSAs are specific for patients with IIM like dermatomyositis, anti-synthetase syndrome or necrotizing myositis. The MSAs include: 
* Anti-synthetase profile (Anti-Jo-1; PL-7; PL-12; EJ; OJ)
* Anti-SRP Ab
* Anti-Mi-2 Ab 
* Anti-TIF-1gamma Ab (synonymous with Anti-P155/140)
* Anti-MDA-5-Ab (CADM-140)
* Anti-NXP-2 (P140) Ab