According to company literature, through selective breeding the company achieved Ashera cats with 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-inducing than the control. However, neither the study nor its underlying data have been published, and Spector himself advises caution as regards his study's interpretation as he used an experimental setup that is generally regarded as less than reliable.