Mutant Sl alleles of mice affect susceptibility to Friend spleen focus-forming virus.

@article{Bennett1968MutantSA,
  title={Mutant Sl alleles of mice affect susceptibility to Friend spleen focus-forming virus.},
  author={Michael Bennett and Richard A. Steeves and Gustavo Cudkowicz and Edwin A. Mirand and Liane Brauch Russell},
  journal={Science},
  year={1968},
  volume={162 3853},
  pages={564-5}
}
Mice of genotypes S1/S1(d), S1/+, and S1(d)/+ (but not S1(T)/S1(T) or S1(T)/+) were resistant to spleen focucs-forming virus. The "environment" in which hemopoietic target cells for this virus develop was not conducive for infection or focus formation, or both, but the target cells were not altered directly. The same genes appear to regulate hemopoiesis and leukemogenic transformation.