Figure 4.—

Distribution of SYP-1 along labeled X chromosome pairs. (A) Example images of pachytene region nuclei from syp-1 RNAi germ lines, exhibiting a range of SYP-1 localization patterns. Top, SYP-1 extends along the full length of the X chromosome pair. Middle, SYP-1 is detected in a short stretch adjacent to the HIM-8 focus. Bottom, SYP-1 stretch associated with the X chromosomes is interrupted by a gap. Bar, 2 μm. (B) Graphical representation of the distribution of SYP-1 along the lengths of labeled X chromosome pairs. Each X chromosome pair is represented by a horizontal bar, with white corresponding to regions where SYP-1 was not detected and black corresponding to regions associated with SYP-1. The left end of the chromosome, which harbors the X-PC, was identified by its associated HIM-8 focus (not depicted). Distances from chromosome ends to the ends of the SYP-1 stretches and the positions of discontinuities in SYP-1 stretches are represented as percentage of total chromosome length.