Nuclei make relatively fast movements and bidirectional movements. Kymographs of nuclei made from DIC time-lapse imaging at 200-ms intervals. Edges of the nucleus are outlined. (A) Example of brief, faster nuclear movement in wild type. (B) Example of wild-type nuclear movements backward and forward during migration. (C) Example of normal forward migration, including a rapid run forward, of a nud-2(ok949);bicd-1(RNAi) nucleus. (D) Example of a rapid forward run of an unc-83(e1408);klc-2::KASH nucleus. The x axis is the distance traveled in micrometers. The forward direction of nuclear migration is left to right.