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
In the Skin of a Lion In the Skin of a Lion In the Skin of a Lion is a novel by Canadian–Sri Lankan writer Michael Ondaatje. It was first published in 1987 by McClelland and Stewart. The novel fictionalizes the lives of the immigrants who played a large role in the building of the city of Toronto in the early 1900s, but whose contributions never became part of the city's official history. Ondaatje illuminates the investment of these settlers in Canada, through their labour, while they remain outsiders to mainstream society. "In the Skin of a Lion" is thus an exposé of the migrant condition: