The Bengal cat is a domesticated cat breed created from hybrids of domestic cats, especially the spotted Egyptian Mau, with the Asian leopard cat (Prionailurus bengalensis). The breed name comes from the leopard cat's taxonomic name. Bengals have a wild appearance; their golden shimmer comes from their leopard cat ancestry, and their coats may show spots, rosettes, arrowhead markings, or marbling. They are an energetic breed which needs much exercise and play. Bengal cats are smart, energetic and playful (though in some rare cases they may be quite lazy). Many Bengal owners say that their Bengal naturally retrieves items, and they often enjoy playing in water. The UC Davis Veterinary Genetics Laboratory has studied domestic cat blood types. They conclude that most domestic cats fall within the AB system. The common blood types are A and B and some cats have the rare AB blood type. There is a lack of sufficient samples from Bengals, so the genetics of the AB blood group in Bengal cats is not well understood. One Bengal blood type study which took place in the U.K. tested 100 Bengal cats. They concluded that all 100 of the Bengal cats tested had type A blood. Bengals are often claimed by breeders[37] and pet adoption agencies[38] to be a hypoallergenic breed – one less likely to cause an allergic reaction. The Bengal cat is said to produce lower than average levels of allergens,[38][better source needed] though this has not been scientifically proven as of 2020. Cat geneticist Leslie Lyons, who runs the University of Missouri's Feline and Comparative Genetics Laboratory, discounts such claims, observing that there is no such thing as a hypoallergenic cat. Alleged hypoallergenic breeds thus may still produce a reaction among those who have severe allergies