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© 1977 Oxford University Press

research-article

A QUANTITATIVE HISTOLOGICAL ASSESSMENT OF CELLULAR DEATH, IN RELATION TO MITOSIS, IN RAT THYMUS DURING GROWTH AND AGE INVOLUTION

S. M. HINSULL, D. BELLAMY and A. FRANKLIN

Department of Zoology, University College Cardiff, CF1 1XI

The rates of cellular proliferation and cellular death were investigated in the rat thymus during growth and involution. It was found that the percentage of dead cells gradually increased with age, whilst the rate of cell proliferation declined, indicating that a substantial proportion of lymphocytes that divide in the thymus also die there.

It was also found that there exists a density-dependent distribution pattern of mitotic and dead cells and that this distribution pattern changed with age. It is suggested that this mechanism of density-dependent control of the thymus may be an important factor in the age involution of the thymus.


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