Ubiquitination of MHC II and CD86 by MARCH1 and MARCH8 in haemopoietic professional APCs. Surface expression levels of MHC II and CD86 in (A) splenic cDC1s, cDC2s, pDCs, B cells, macrophages (MAC), and CD4+/CD8+ T cells, (B) blood B cells, (C) thymic cDC1s, cDC2s, and B cells, (D) peritoneal cDC1s, cDC2s, B cells, and small/large MAC, and (E) lung cDC1s, cDC2s, pDC, B cells, and alveolar/interstitial MAC, all purified from WT mice or mice deficient in either MARCH1 or MARCH8. Bars represent mean ± SD with each symbol representing an individual mouse (n = 4–5). Statistical analysis was performed using one-way ANOVA followed by Sidak's multiple comparisons test. ∗∗∗∗p < 0.0001, ∗∗∗p < 0.0002, ∗∗p < 0.002, ∗p < 0.03, n.s. not significant.