All of the following cell types undergo cell division, EXCEPT:

Myocyte cell division in the human hea ceases a few weeks after bih. Thereafter, enlargement of the hea is as a result of cell hyperophy or the laying down of collagen in the extracellular space. DNA turnover is almost undetectable except in pathologic states. Approximately 20% of myocytes in the human hea have two nuclei, so that cell separation, rather than mitosis, could bring about a small increase in the total cell number. Ref: Francis G.S., Tang W., Walsh R.A. (2011). Chapter 26. Pathophysiology of Hea Failure. In V. Fuster, R.A. Walsh, R.A. Harrington (Eds), Hurst's The Hea, 13e.