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.
Saliva is a seromucinous liquid that has several major functions within the oral cavity which include lubrication, digestion, antimicrobial action, buffering, hormone regulation and taste sensation. It contains 99.5% water and the rest is electrolytes, mucus, glycoproteins, enzymes and antibacterial compounds. There are two major types of saliva that are secreted from the salivary glands and they are serous and mucinous.