V-set and transmembrane domain containing 1 (VSTM1) encodes two main splicing isoforms, VSTM1-v1 and VSTM1-v2 (Guo, Cell Immunol 2012, 278: 136–142; Steevels, J Immunol. 2010;184:4741–8).
Killer cell immunoglobulin-like receptors (KIRs) are transmembrane glycoproteins expressed by <1-8% NK cells and subsets of CD8+ T cells (Melero et al., 1994, The Journal of Immunology, 152(4)).
PSG1 is the most abundantly expressed of the 11 different pregnancy-specific glycoproteins (PSGs) which are members immunoglobulin superfamily (Blois, Mucosal Immunol, 2014; 7:348–358).
Human activating receptor natural-killer group 2, member D (NKG2D) is a 35 kDa type II transmembrane glycoprotein and a part of CD94/NKG2 family of C-type lectin-like receptors