NCAM1 and systemic lupus erythematosus: Although the authors argued that this indicates that NKT cells are not reduced in the relatives of lupus patients, studies indicate that CD56 is a poor marker for the immunoregulatory invariant NKT cell population because it is also expressed on some other peripheral blood T cells [30], whereas the Vα24+Vβ11+CD3+ cells examined in the present study correlate strongly with this population [30-32].