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The human body is made up of approximately 37 trillion cells, and each cell contains a complete set of instructions that determine how it grows, functions, and behaves. These instructions are encoded in the cell's DNA, which is a long molecule that contains the genetic code for every living thing on Earth. The DNA is made up of four different nucleotide bases - adenine, guanine, cytosine, and thymine - which are arranged in a specific sequence to form genes.