The test plant of IBL in Gunma Prefecture is registered for such kind of experiments and has produced a number of recombinant proteins from transgenic silkworms already. The Astellas contract starts on March 31, 2015.
IBL news release, March 31, 2015
Immuno-Biological Laboratories (IBL) announces contract with Astellas on production of human fibrinogen in recombinant silkworms