In your cells, you have the nucleus, that contains the DNA. The DNA is a double-stranded sequence of nucleotides that contains coded information that other organites of the cell can use to build proteines, but it never comes out of the cell.
Instead, there are in the nucleus enzymes that can copy the information of the DNA into RNA (a single-stranded sequence of nucleotides) which is called “messenger” because it is used to transfer this information from the nucleus to the organites that produce the proteines.
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