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Changing number of rabbits with surviving skin homografts. The horizontal axis is the number of days after transplantation, while the vertical axis is the number of rabbits maintaining homografts, converted to a scale with ten as the maximum. Peter Medawar, ‘The behaviour and fate of skin autografts and skin homografts in rabbits’, J. Anat. 78, 176–199 (1944), at p. 186.
