Baculovirus vectors are very useful in producing high levels of proteins. This system yields recombinant proteins similar to their original counterparts. Expression of foreign genes occurs in infected cells which provide a suitable environment for post-translational modifications and folding of the protein product. The size of baculovirus genome allows to insert large DNA segments (up to 25kb). Constructions of recombinant baculoviruses are very simple and need minimum of viral manipulation.