Acts as a MHC class II receptor (PubMed:20519654). When stimulated on its own, does not play a role in cytokine production or the release of cytotoxic granules by NK cells and cytotoxic CD8(+) T cells (PubMed:17213291, PubMed:18991291). Does not act as an Fc receptor (PubMed:18991291). {ECO:0000269|PubMed:17213291, ECO:0000269|PubMed:18991291, ECO:0000269|PubMed:20519654}. This is the function of FCRL6 (Fc receptor like 6, Ensembl gene identifier ENSG00000181036).