Genes can be involved with controlling expression of other genes during developments. Some of which, like the hox genes, code for transcription factors that regulate when other genes are expressed. So there are genes that regulate the expression of a number of other genes as a "coordinate expression of batteries of genes". These 'master' genes that control the expression of other genes code for:

Answer is "Proteins"

Explanation:

Proteins are made up of amino acids, or organic compounds, that are linked together through peptide bonds. Different combinations of these amino acids make up all of the proteins from the fibrin that forms scabs on a cut finger to a protein that allows rattle snakes to detect body heat The human body uses proteins for many things, including repairing and building tissues, acting as enzymes, aiding the immune system, and serving as hormones. Each of these important functions requires a slightly different form of protein. In spite of their differences in structure, all proteins contain the same basic sub-components Proteins are something that we've heard about because they're an important part of our diet. If we look at this nutrition label for macaroni-and-cheese, we can see that, in addition to containing several grams of carbohydrates and fats, there also contain proteins