Brome Mosiac Virus (BMV) -
BMV infects several species of Graminae, including barley. It has three genomic segments (I, 2 and 3) each packaged into a separate particle. The CP gene is located on RNA segment 3, and is the only target site for DNA insertion, although this prevents formation of virus particles. Placing a transgenes downstream to the regulatory sequences of the cp gene of BMV will give high yields of the protein encoded by it.