Keywords: Ag(s); antigen(s); Anti-C1q; anti-C1q autoantibodies; APCs; antigen-presenting cells; CatL; Cathepsin L; CatS; Cathepsin S; CLIP; class II-associated invariant chain peptide; DCs; dendritic cells; DMEM+; DMEM supplemented with 1% penicillin/streptomycin;