The structure of a gene consists of many elements of which the actual protein coding sequence is often only a small part. These include DNA regions that are not transcribed as well as untranslated regions of the RNA.
Often, how large a part of the structure of a gene is the protein coding sequence? What often plays only a small part in the structure of a gene?  What is one of the many elements that the structure of a gene consists of? What is another element of the structure of a gene? What elements does the structure of a gene consist of?