These genetic variants are believed to cause changes in the way the bodyâs T cells behave. T cells are immune system cells that normally fight off harmful invaders, such as viruses and bacteria. In people with psoriasis, however, T cells also attack healthy skin cells by mistake. This immune system response results in a range of reactions, including: 1  enlargement of blood vessels in the skin.  increase in white blood cells that stimulate the skin to produce new cells more quickly than usual.
Teeth. Zebra have several types of teeth that help them survive in their habitats. In the front of their mouths, zebra use their strong incisors for biting off grass and other vegetation. In the rear of their mouths, zebra have molars and premolars to grind down their food.
Hartmann's zebra (Equus zebra hartmannae) is one of two subspecies of mountain zebra. As the species name suggests, this zebra lives on mountain slopes and plateaus as high as 6,500 feet above sea level.This subspecies is endemic to Namibia, Angola and South Africa, where fewer than 30,000 survive.he three zebra species are part of the Equidae family, which also includes asses and horses. Zebras are endemic to sub-Saharan Africa. The word zebra is Portuguese for wild horse.. It may also have its origin in the Latin word equiferus, another word for a type of wild horse.