Exons are crucial segments of genes that code for proteins. They make up the coding region of genes, which is responsible for producing functional proteins. Synonyms for the word exon include coding exon, expressed sequence, protein-coding segment, and coding region. The term "coding exon" signifies that the segment is responsible for generating the protein and that it is translated into amino acids. The "expressed sequence" describes a segment of DNA that is transcribed into RNA, which is then translated into proteins. The phrase "protein-coding segment" emphasizes that the exon plays an integral role in synthesizing proteins. Finally, the "coding region" represents the nucleotide sequence that codes for the protein.