FCGR3B and systemic lupus erythematosus: Improved assays based on the paralog ratio test (PRT) [Armour et al., 2007] and multiplex ligation probe amplification (MLPA) [Schouten et al., 2002] have allowed some studies to suggest an association of the FCGR3B deletion with SLE [Morris et al., 2010; Niederer et al., 2010b] and RA [Robinson et al., 2012].