Coexpression of BFDV Rep and CP. Insect cells were either mock infected or infected with the indicated recombinant baculoviruses. Cell lysates were analyzed on a 12% SDS-polyacrylamide gel followed by Western blotting with (a) monoclonal antibodies directed against the His6 affinity tag fused to the N terminus of Rep or (b) sera from BFDV-infected psittacines. Lanes 1, mock-infected cells; lanes 2, wt CP; lanes 3, Rep; lanes 4, Rep plus CP; lanes 5, CAT; lanes 6, CAT plus wt CP; lanes M, molecular size markers.