Lysosomal cysteine and aspartic proteases are heterogeneously expressed and act redundantly to initiate human invariant chain degradation.
Costantino CM, Hang HC, Kent SC, Hafler DA, Ploegh HL. Lysosomal cysteine and aspartic proteases are heterogeneously expressed and act redundantly to initiate human invariant chain degradation. J Immunol. 2008 Mar 01; 180(5):2876-85.