1 mg (2 mg/mL x 0.5 mL solution in 0.05M acetic acid) of mouse type II collagen purified from mouse sternal cartilage. Purity: >99% by SDS-PAGE analysis (free of pepsin and proteoglycans). Molecular Weight: 300 kDa. Intended for use as antigen for immunizing animals inced arthritis (CIA) model, a standard for collagen analysis by SDS-gel, or substrate for collagenase activity