KIF11 and xeroderma pigmentosum group D: Unexpectedly, the overexpression of the nonphosphorylatable form Eg5/S1033A in XPD/R683W cells significantly rescued the mitotic spindle and chromosome segregation defects observed at anaphase [visualized by the α-tubulin marker and 4′,6-diamidino-2-phenylindole (DAPI) staining, respectively; Fig. 7A (compare image A.7 with A.15 and A.5 with A.13); quantification, Fig. 7, B and C (bars 2 and 4)] and at telophase (fig.