Mu chain

 Lack of development of B cells
 Lack of production of Immunoglobulins
 Intact cell-mediated immunity
 Development of induced proliferative glomerulonephritis proteinuria, renal impairment and crescent formation similar to heterozygous mice
 Cutaneous delayed type hypersensitivity to sheep immunoglobulin similar to heterozygous mice

Database link:

MEDLINE Citations