* Cleavage furrow regression: Cells divide and almost complete division but then the cleavage furrow begins to regress and the cells merge. This is thought to be caused by nondisjunction in chromosomes but the mechanism by which it occurs is not well understood. Cartoon of cleavage furrow formation and resolution. (A) depicts a normal cleavage furrow resolution. (B) depicts a cleavage furrow regression leading to a<unk> * Failed cytokinesis: The cell can fail to form a cleavage furrow, leading to both nuclei remaining in one cell. * Multipolar spindles: Cells contain three or more centrioles, resulting in multiple poles. This leads to the cells pulling chromosomes in many directions that end in multiple nuclei found in one cell. * Merging of newly formed cells: Two cells that have just finished cytokinesis merge into one another. This process is not entirely understood.
Binucleated cells
Nucleated red blood cell
Pyknocytosis
Dyskaryosis
Hypersegmented neutrophil
Cowdry bodies
Small cleaved cells
Monochromacy