Successive codons that are contiguous and not separated by noncoding bases or groups of bases. Bacterial genes do not have introns (q.v.), and therefore the sequences of amino acids in polypeptides and of codons in the gene are colinear. Most eukaryotic genes contain coding regions called exons (specifying amino acids) interrupted by noncoding regions called introns, and in these situations the code is said to contain commas.
Subjects: Genetics and Genomics.