Interestingly, genes involved in endocytosis/antigen processing (SNX1, SNX2, TLR4, LAMP1) (39–42) were all found to be higher in PsA, compared to RA (Figure 3D) which is in agreement with the impaired endocytosis observed in the RA patients (Figure 2B). The gene discussed is SNX2; the disease is rheumatoid arthritis.