Acts as an activating immune receptor through its interaction with ITAM-bearing adapter TYROBP, and also independently by recruitment of GRB2. Interacts with TYROBP, which enhances cell surface expression and activation properties. Interacts with GRB2 in the presence of FYN. Expressed exclusively in myeloid lineages. Phosphorylation on Tyr-188 by FYN is required for interaction with GRB2. Belongs to the CD300 family. Extended N-terminus. Extended N-terminus. Extended N-terminus.