Strain specific H2-Kb/H2-Db (α chain of MHC-I molecule) expression analysis in B-NDG mice and B-NDG H2-K1/H2-D1 KO mice by flow cytometry. Bone marrow, spleen and blood were collected from B-NDG mice and B-NDG H2-K1/H2-D1 KO mice, and analyzed by flow cytometry. Mouse H-2Kb/H-2Db was only detectable in B-NDG mice but not in B-NDG H2-K1/H2-D1 KO mice.