Pt. 1 is a 12-week randomized, double-blind, active-control, parallel-group, multi-center global study. The primary end point is 75% improvement from baseline according to the Psoriasis Area and Severity Index (PASI-75). Comparing CHS-0214 to Enbrel for efficacy and safety at a dosage of 50mg subcutaneous (Sc) twice weekly.