Structural genes, also known as coding genes, are responsible for producing specific proteins necessary for proper cellular function. Synonyms for this term include protein-coding genes, functional genes, and expressed genes. These genes provide instructions for the production of proteins that make up the majority of cellular structures and help carry out the functions of the body. The term structural gene is commonly used in the field of genetics, particularly in studies focused on the mapping and sequencing of the human genome. These genes are essential for the development and maintenance of the body, and understanding their function is vital for new advances in medicine and biotechnology.