Google is a particularly good search engine that provides relevant hits, quickly. In the context of this site, you might it valuable for finding information on proteins of interest.

Similar in concept to citation analysis used for scientific literature, Google's strength lies in its ability to rank the importance of sites depending on the number of other external sites that link to it. In addition to counting the number of links pointing to a page, Google also uses an iterative process to analyse where those links are coming from, and gives more weight to those coming from pages with a high "authority" rating.