NCR,mAR,NKp,Activating receptor,mNKp,NK-p,Activating receptor1,Lymphocyte antigen 94,Lymphocyte antigen94,mAR-1,mNKp46,Naturalkiller cell p46-related protein,NKp46,NK-p46,Ly94,Ncr1, NCR1,CD335, also known as NKp46, is a single-pass type I membrane protein of 46 kD. It belongs to the natural cytotoxicity receptor (NCR) family and contains two Ig-like (immunoglobulin-like) domains. It's expression is restricted to NK cells and a subset of NKT cells, it's not expressed in CD1d-restricted NKT cells. CD335 is a receptor for viral hemagglutinins and heparan sulfate proteoglycans and is involved in NK cell activation.