Allerca is a San Diego-based biotechnology company which claims to have bred hypoallergenic cats through a selective breeding process. According to company literature, the company's cats have significantly reduced levels of a particular protein that humans suffer allergic reactions to. The journal Nature reported in September, 2006 that in an Allerca-funded study, Sheldon Spector, a clinical allergy expert at the University of California, Los Angeles, found the company's cats to be less allergy-… (More on Allerca)