Simultaneously, the abundance of mature LMP2 and MECL-1 was increased following listeria infection of lmp7−/− mice (Fig. 5 D–E), which is in line with the formation of LMP2/MECL-1/β5 proteasomes in infected lmp7−/− liver as shown in Fig. 4A. The gene discussed is PSMB9; the disease is listeriosis.