SLAMF1 and systemic lupus erythematosus: There was up‐regulation of SLAM family receptors, CD229 and of CD352 (NTB‐A, SLAMF6) in T cells from patients with SLE compared with healthy controls.17 However, among the 11 SLE patients studied, there was a lower correlation between expression and disease severity for CD229 compared with CD352.17 The association between CD229 expression levels and SLE susceptibility is not straightforward.