Baculovirus is a kind of virus which takes arthropod as a single host. Its genome has a large capacity and can accommodate the insertion of 38 kb foreign gene fragments. Studies have shown that wild baculovirus can enter mammalian cells but will not turn on the expression of its own protein, unless the mammalian promoter is inserted upstream of that gene. BacMam Expression https://bes.creativebiomart.net/bacmam-expression-service.html