FOLR2 and lupus nephritis: Yet, the recently available single cell sequencing data describing the immune landscape of lupus nephritis revealed five clusters of myeloid cells [114], whereby cells in cluster 4 (CM4) were found to express the index markers of ercDCs, CD14, CD209 and CD163, together with further ercDC marker genes CD64, VSIG4, MSR1, STAB1, MerTK, FOLR2 and C1Q.