The Journal of Experimental Medicine
StemCell Technologies
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The Journal of Experimental Medicine, Vol 42, 275-290, Copyright, 1925, by The Rockefeller Institute for Medical Research New York

ARTICLE

PHYSIOLOGICAL ONTOGENY : A. CHICKEN EMBRYOS. IV. THE NEGATIVE ACCELERATION OF GROWTH WITH AGE AS DEMONSTRATED BY TISSUE CULTURES.



Alfred E. Cohn M.D.1, Henry A. Murray Jr. M.D.1, and With the Assistance of Alma Rosenthal.

1 From the Hospital of The Rockefeller Institute for Medical Research.

1. Observations on tissue cultures of heart muscle from chicken embryos indicate that in general the growth rate of the individual cells decreases with age. The negative acceleration of growth is greatest at the beginning of life as in the intact embryo.

2. The latent period before growth commences increases with the age of the implanted tissue, but in a different fashion. The acceleration of the latent period is greatest near the end of the incubation period, thus demonstrating that the factors determining the initiation of growth and those determining the extent of growth are not similar.

 Submitted on February 25, 1925


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