These included – Polymyositis/Scleroderma antigen 100 (Pm/Scl-100), Proliferating Cell Nuclear Antigen (PCNA), Anti-liver cytosolic antigen type 1 (LC-1), and Heterodimer Ku protein subunits 70 & 80 (KU P70/P80). Here, PCNA is linked to polymyositis.