The Normal Cell Cycle

The normal cell cycle consists of a definable sequence of events that characterize the growth and division of cells and can be observed by morphological and biochemical means. The cell cycle is depicted in Fig. 55.1. Two of the four phases of the cell cycle can be studied directly: the M-phase, or mitosis, is easily visible using light microscopy because of chromosomal condensation, spindle formation, and cell division. The S-phase is the period of DNA synthesis and is observed by measuring the incorporation of tritiated thymidine into cell nuclei.

The mitotic index is the fraction or percentage of cells in mitosis within a given cell population. The thymidine labeling index is the fraction of cells incorporating radioactive thymidine. They represent cells in M-phase and S-phase and define the proliferative characteristics of normal and tumor cells.

10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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