Protein or the physical region of the protein that participates in chemical catalysis. In solution proteins also undergo variation in structure through thermal vibration and the collision with other molecules. Proteins can be informally divided into three main classes, which correlate with typical tertiary structures: globular proteins, fibrous proteins, and membrane proteins. Almost all globular proteins are soluble and many are enzymes. Fibrous proteins are often structural, such as collagen, the major component of connective tissue, or keratin, the protein component of hair and nails. Membrane proteins often serve as receptors or provide channels for polar or charged molecules to pass
Artificial nails Over time, exposure to MMA could cause lasting effects such as drowsiness, light-headedness, and trembling of the hands. Musicians who play stringed instruments may wear artificial nails as an aid in playing. Some guitarists like Don Ross, Doyle Dykes and James Taylor are known for doing so. Many intermediate and advanced classical and finger-style guitarists use varieties of fake nails to obtain a consistent, clear and bright tone with each pluck. The players of many ancient Chinese instruments, like the guqin, pipa, and ruan, also commonly used artificial nails. Even the Indian instrument sarod requires nails for tipping, so many