In 1973, C.W. Friis of Denmark found hairless mice with spontaneous mutation in BALB / C inbred mice. The mutant mice developed BALB / c-nu due to poor thymus development and lack of immune T cells. Our company introduced it from Shanghai Branch of national rodent experimental animal seed center on September 3, 2009. Characteristics: inbred mice, hairless, naked and thymus free, mainly used for T cell deficiency, cancer, skin diseases, immunology, etc.