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
Afro-textured hair (especially Black women) "had many Eurocentric features, including hairstyles." However, during the movement, the Black community endeavoured to define their own ideals and beauty standards, and hair became a central icon which was "promoted as a way of challenging mainstream standards regarding hair." At this time, an African-American person's "ability to conform to mainstream standards of beauty [was] tied to being successful." Thus, rejecting straightened hair symbolized a deeper act of rejecting the belief that straightening hair and other forms of grooming which were deemed 'socially acceptable' were the only means of looking presentable and attaining success in society. The