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).
Seattle is rolling out 11 rainbow crosswalks in Capitol Hill this week, adding a colorful bang to the annual Pride celebration. The crosswalks cost the city $66,000, said Seattle Department of Transportation spokesman Rick Sheridan, and are permanent.
Rainbow crosswalks, Tel Aviv 2012. In May 2012, Tel Aviv city hall painted a crosswalk in rainbow colors for a photo shoot to promote TYP: Ivri Lider and Johnny Goldstein, the act scheduled to headline the Gay Pride Parade's main concert.