they are polymeric chains formed by the union of numerous amino acids, joined in sequence by bonds called peptides.
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In nature there are thousands of proteins, different in structure and function; this variability depends on the number, sequence and type of amino acids, and on the overall three-dimensional structure (conferred by other stabilizing bonds).
Proteins perform many functions that are indispensable to say the least, so much so that the human body contains up to 12-15% of its weight.
The most important functions of proteins are: plastic (make up tissues), bioregulatory (enzymes), hormonal, neurotransmitters, membrane channels, blood transport, immune etc.
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