Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org|Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org|Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org|Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org|Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org|Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA. mnk@informatics.jax.org