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.
The common Zebra is called âEquus burchelliâ and can also eat dry and rough grass like red oat grass. Other grasses zebras eat include Cenchrus ciliaris and Cynodon catylon. There is some variation in the diets of different types of Zebras as well. Grevyâs zebra eat very coarse grass that many other animals in the horse family canât digest at all. Grevyâs zebra also eats highly fibrous grasses with tough textures like Eleusine jaegeri. Because Grevyâs zebras live in dry areas, they often eat local foliage and bark if itâs too dry for grass to grow.