Yoel Romero looks like he is next for Michael Bisping, while Luke Rockhold and Ronaldo Souza are still waiting in the wings; the Ultimate Fighting Championship does not need another 185-pound power player right now....
In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
The inhibitor competes for the same active site as the substrate molecule. The inhibitor may interact with the enzyme at the active site, but no reaction takes place. The inhibitor is stuck on the enzyme and prevents any substrate molecules from reacting with the enzyme.