Junior dos Santos and Cain Velasquez squared off after the UFC 155 press conference Thursday afternoon.Subscribe to our channel for more MMA videos! Click here: http://www.youtube.com/subscription_center?add_user=mmafightingonsbn- Check us out on Facebook (Facebook.com/MMAFighting) and follow us on Twitter (@MMAFighting)!- MMA Fightinghttp://www.mmafighting.com