Ganot P, Thompson EM.

Patterning through differential endoreduplication in epithelial organogenesis of the chordate, Oikopleura dioica.

Dev Biol. 2002 Dec 1;252(1):59-71. doi:10.1006/dbio.2002.0834

In the epithelial cells, “endoreduplication begins before tailshift and stops during gamete differentiation.” “Endocycles are asynchronous within a given field of oikoplastic cells, but the replication pattern is bilaterally symmetrical.” “In mature animals, final ploidy levels ranged from a low of 34 C in chain of pearl nuclei to 1300 C in giant Eisen nuclei.” Cells with higher ploidy had shorter gap phases.