Polypeptide

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.