Biological products include a wide range of products such as vaccines, blood and blood components, allergens, somatic cells, gene therapies, tissues, and recombinant therapeutic proteins. Biologics can be composed of sugars, proteins, or nucleic acids or complex combinations of these substances, or may be living entities such as cells and tissues. Biologics are isolated from a variety of natural sources — human, animal, or microorganism and may be produced by Biotechnology methods and other cutting-edge technologies. 

Source: www.fda.gov