MHCII/B2m-KO(NMG)

All sequences from the upstream of  mouse H2-Ab1 gene exon 2  to the upstream of the H2-Ea-ps gene  exon 1 were knocked out to obtain H2-Ab1、H2-Aa、H2-Eb1、H2-Eb2、H2-Ea-ps knockout mouse models.Also, B2m gene was knocked out. These MHC class I and II molecule-deficient mice were on the NMG genetic background and also lacked cell surface expression of both class II-A and class II-E MHC proteins and B2m of class I.