Supplemental Movie 2

A migrating P-cell nucleus.
Movie showing a larva at the time of nuclear migration where P1 and P2 have already migrated to the ventral cord (left). P3 or P4 nucleus migrating from lateral (right) to ventral (left). The remaining nuclei have not yet migrated. The movie shows six frames taken at five minute intervals during the nuclear migration event. The worm is curved such that ventral is out and lateral is in for all P-cell pairs, anterior is up and to the left.