Example: ul > li will match all <li> elements that are inside a <ul> element. Descendant selectors. The ' ' combinator selects nodes that are children (not necessary direct children) of the former specified element. Example: div span will match any <span> element that is inside a <div> element.
Generic Firazyr. Because a patent is in place until  July 2014, companies are currently not allowed to make a generic version of Firazyr (icatibant). However, after this patent expires, a generic product may become available.
As previously noted, Levitra's patent is set to expire in 2018, and Cialis has dual patents, one expiring in November 2017 and the other due to expire in 2020. Since Viagra's patent expiration is no longer an issue, the big question is how the patent extension will affect the marketplace.