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.
The sublingual salivary glands, the smallest ones, are located under the tongue secreting saliva from many small openings under the tongue. Hundreds of smaller salivary glands can be found in the oral cavity at the cheeks, lips, tongue, hard and soft palates, and the floor of the mouth.