Fig. 4. Northern blot analysis and whole-mount in situ hybridization. (A) mRNA levels of
csq-1 at different developmental stages were assayed. Equal amounts (1 ug) of poly(A)+ RNA were loaded in each lane and hybridized with a 32P-labeled
csq-1 cDNA probe. A transcript of approx. 1.5 kb is observed in all three lanes. (B-E) In situ localization of
csq-1 RNA at different developmental stages, viewed under a light microscope (Nomarski optics). Antisense probes show
csq-1 expression (arrows) along the mid-body line in the twofold stage embryo (B), in body-wall muscle cells in the larva (C) and in the adult (D,E). (F) DAPI stained nuclei of the muscle cells showing
csq-1 expression. Arrows indicate cytoplasmic signals and arrowheads indicate nuclei of body-wall muscle cells. Bars, 50 um.