High Quality Content by WIKIPEDIA articles! Protein synthesis is the process in which cells build proteins The term is sometimes used to refer only to protein translation but more often it refers to a multi-step process, beginning with amino acid synthesis and transcription of nuclear DNA into messenger RNA which is then used as input to translation ожиыз The cistron DNA is transcribed into a variety of RNA intermediates The last version is used as a template in synthesis of a polypeptide chain Proteins can often be synthesized directly from genes by translating mRNA When a protein is harmful and needs to be available on short notice or in large quantities, a protein precursor is produced A proprotein is an inactive protein containing one or more inhibitory peptides that can be activated when the inhibitory sequence is removed by proteolysis during posttranslational modification.  Valiant2010 г Мягкая обложка, 116 стр ISBN 6130349149.