Johnson & Johnson's (JNJ 0.01%) decision to launch a mid-stage study evaluating a slate of hepatitis C drugs that includes Achillion Pharmaceuticals' (ACHN) ACH-3102 could lead to a best-in-class hepatitis C therapy down the road. 

In the following slideshow, I outline what you need to know about this trial and why it matters to Achillion Pharmaceuticals' investors.