Figure 4.

Fragment analysis of 18S-b(α). (A) Schematic representation of probes that are antisense to the 18S rRNA. Top bar represents 18S rRNA. The shaded region indicates the segment of 18S rRNA, at nucleotides 680–784, complementary to probe 18S-b(α). Probe (α1) is complementary to the 18S rRNA at nucleotides 680–713, (α2) is complementary at nucleotides 715–743, and (α3) is complementary at nucleotides 746–784. (B) Gel electrophoresis after cross-linking of ³²P-labeled RNA probes to ribosomal subunits. The positions of the rRNAs were determined by ethidium bromide staining of the agarose gels.