Size Control in Animal Development

the transplanted spleens attains the mass of one normal “The most obvious differences between different aniadult spleen, suggesting that their growth is mainly conmals are differences in size, but for some reason the trolled by factors outside the spleen (Metcalf, 1964). zoologists have paid singularly little attention to them.” Similar transplantation experiments, as well as tissue —J. B. S. Haldane, On Being the Right Size, 1927 culture experiments, indicate that most animal organs