Northern analysis of Bm1 RNAs induced by stress. RNA is from untreated BmN cells (lane 2) or from larvae that are untreated (lane 1), treated with cycloheximide (lane 3), infected with baculovirus for 5 days (lane 4), treated with sodium arsenite (lane 5), or recovering from heat shock for 1.5 hours (lane 6). This blot was hybridized with primer Bm1 78, washed, and rehybridized with primer 5S 119. Positions are indicated for scBm1, 190-nt Bm1, 470-nt Bm1 RNA, 5S ribosomal RNA, and length markers “M.”