A complement system is a group of proteins that includes interferons and interleukins.
Proteins are large, complex molecules that play many important roles in the body. They do most of their work inside cells and are necessary for the structure, function, and regulation of body tissues and organs.
Chemically, proteins are made up of amino acids. Amino acids are organic compounds composed of carbon, hydrogen, nitrogen, oxygen, or sulfur. Just as amino acids are the building blocks of protein, protein is the building block of muscle mass, according to the National Institutes of Health (NIH).
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