Abstract
Summary
Line C57 black mice has a mean of 6.3 Peyer's patches; strains C, Swiss, and dba, means from 8 to 9; and strain C3H, a mean of 10.7. Differences between these groups are significant, according to the X 2 test. There is a direct correlation between the number of Peyer's patches and the incidence of spontaneous mammary tumors in these 5 pure lines of mice.
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