MITF and coinfection: Furthermore, and to our surprise, the co-infection with the IC-IGRP baculovirus completely abolished the expression of muNS-Mi, thus completely eliminating the possibility of sequestering IGRP inside the MS (Fig. 4a, compare lanes 3 and 4), what suggests that in the baculovirus system, IGRP either is also toxic or at least has a negative effect on protein expression or the baculovirus replicative cycle.