Figure 9.

Anti-Ct-RSF antibodies interfere with the association of Ct-RSF and hrp45 with nascent pre-mRNAs. Individual salivary gland cells were injected with anti-Ct-RSF antibodies. After incubation for 90 min in hemolymph, the glands were fixed and immunostained for Ct-RSF, hrp45, or U2 B″ as indicated. Each picture shows a confocal section through a cell nucleus. Arrows point out the transcriptionally highly active BR genes on chromosome IV. Controls cells were injected with an unrelated antibody. Bars, 20 μm.