Fig. 7. Rad18^Sc protein localizes to unsynapsed regions of the 1¹³ bivalent. The morphology of the 1¹³ bivalent was classified as partially synapsed A shape (PA, intermediate degree of synapsis), partially synapsed horsheshoe shape (PH, almost complete synapsis), partially synapsed rest (PR, low degree of synapsis), and completely synapsed (CS). The accumulation of Rad18^Sc to these regions was analyzed by immunostaining (upper panel). Over groups, the number of nuclei positive for Rad18^Sc was found to be increased when synapsis of these bivalents was less complete (lower panel). The arrowhead indicates the 1¹³ bivalent.