Polypeptide
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A polypeptide is a chain of proteins produced by a ribosome from a mRNA template. (It is later folded into a protein.)
The process of protein synthesis
See also: Protein synthesis
After the mRNA has been transcribed from the DNA in a cell's nucleus, it is modified (stripped of introns, or non-coding regions), and then let out of the nucleus into the cytoplasm. There, it is met by the two pieces of a ribosome and translation begins, producing a string of amino acids (a polypeptide) from the template provided from the mRNA.