Recombinant proteins are proteins that are produced through genetic engineering techniques. This involves taking a gene that encodes for a specific protein of interest and inserting it into a host organism, such as bacteria or yeast, which then expresses the protein. The host organism can be chosen based on the desired properties of the protein, such as stability or solubility, and can also be manipulated to improve these properties. Recombinant proteins have many applications in various fields such as biotechnology, medicine, and agriculture. For example, they are used as therapeutics, diagnostic reagents, research tools, and industrial enzymes. They can be used to produce large amounts of a specific protein, such as insulin for diabetes treatment, or to make a protein that is not naturally produced in a host organism. Additionally, recombinant proteins can be used to produce modified versions of a protein, such as a protein with improved stability or activity.