This is mostly caused by tires that are overinflated. When a tire is overinflated, the tire, in essence, bulges out more in the center. The tire then rides mostly on that bulge and that bulge wears faster than the sides of the tire. Keeping your tires properly inflated can help you to avoid center wear.
Lysozyme is abundant in a number of secretions, such as tears, saliva, human milk, and mucus. It is also present in cytoplasmic granules of the macrophages and the polymorphonuclear neutrophils (PMNs). Large amounts of lysozyme can be found in egg white.
Enzymes with lysozyme activity are found in many animals in host defense settings as well as in digestive organs. High concentrations of lysozyme are found in avian egg white, and in mammalian tears, milk, respiratory secretions, granulocytes, and macrophages. In human granulocytes, lysozyme is a highly abundant protein in both phagocytic and secretory granules, and is the principal secreted protein of macrophages.