Data S1. Sequential digest of HLA-DR3.

Data S2. Reciprocal regulation of CatG activity and DR levels in primary human APC.

Data S3. Effects of CatG addition on MHC II levels in intact APC (Western blot).

Data S4. Effects of CatG addition on cell surface MHC II levels in intact APC.

Data S5. Effects of CatG inhibition on cell surface MHC II levels using primary intact APC.

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