Answers are grounded in this paper and cite their sources.
George L Wolff; GROWTH OF INBRED YELLOW (AYa) AND NON-YELLOW (aa) MICE IN PARABIOSIS, Genetics, Volume 48, Issue 8, 5 August 1963, Pages 1041–1058, https://doi.
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George L. Wolff (1963) studied this question.
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