Immunodeficiency 54(MIM 609981)/Increased grip strength (Mcm4tm1b(KOMP)Mbp/Mcm4+)/(Prkraem1(IMPC)H, Hpcaem1(IMPC)H)‡‡. The gene discussed is MCM4; the disease is primary immunodeficiency with natural-killer cell deficiency and adrenal insufficiency.