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Proteins are fundamental macromolecules that perform a vast array of functions essential for the growth, development, and maintenance of living organisms. One of the primary functions of proteins is structural support. Proteins such as collagen, keratin, and elastin provide mechanical strength and flexibility to tissues. Collagen, found in connective tissues, tendons, and bones, imparts tensile strength, while keratin forms hair, nails, and the outer layer of the skin, protecting against physical damage and microbial invasion. Elastin contributes to the elasticity of tissues like the lungs, _____ ___ ____ ______ ____.
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