SIM and SIM.R mice are histoincompatible.

@article{Furmanski1978SIMAS,
  title={SIM and SIM.R mice are histoincompatible.},
  author={Philip Furmanski and M E Dietz and David L. Hines and J F Marcelletti},
  journal={Virology},
  year={1978},
  volume={86 1},
  pages={287-90}
}