Context: 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.

Question: Often, how large a part of the structure of a gene is the protein coding sequence?
Answer: often only a small part

Question: What often plays only a small part in the structure of a gene? 
Answer: the actual protein coding sequence

Question: What is one of the many elements that the structure of a gene consists of?
Answer: DNA regions that are not transcribed

Question: What is another element of the structure of a gene?
Answer: untranslated regions of the RNA

Question: What elements does the structure of a gene consist of?
Answer: DNA regions that are not transcribed as well as untranslated regions of the RNA