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Many biologists have hoped that a more direct attack on the problems of aging and senescence might be possible through study of "transient tissues." By transient tissues are meant such things as the placenta, the deciduous horns of animals, and corpus luteum, and other elements of ovarian tissue. These and a number of related topics are discussed learnedly and with a great deal of interest in this colloquium. Whether to consider erythrocytes as transient tissues was not settled, and in general surprisingly little use was made of information obtained from tissue cultures, which may still be the most hopeful of all approaches to the problems of aging. The essence of the question is whether aging represents a foreordained manifestation of doom with a fixed and limited potential written into the script at the time of birth or even long before or whether aging represents this process as it is modified
Bean WB. Ciba Foundation Colloquia on Ageing. Vol. II. Ageing in Transient Tissues.. AMA Arch Intern Med. 1957;99(2):322. doi:10.1001/archinte.1957.00260020158036