CD300c is a member of the CD300 family of receptors, which are type I transmembrane proteins expressed in both myeloid and lymphoid lineages and modulate immune responses by their stimulatory and inhibitory capabilities (PMID: 30485414). CD300c, also known as CLM-6, CMRF-35 and IgSF16, is composed of an IgV-like extracellular domain, a transmembrane domain and a short cytoplasmic tail. It is expressed on the surface of monocytes, macrophages, dendritic cells, neutrophils, some T and B lymphocytes (PMID: 1349532; 30498497). CD300c has been reported as an activating receptor expressed on monocytes and that it has a potential role in inflammatory responses (PMID: 23571507). It has also been identified as a T cell co-inhibitory molecule (PMID: 30498497).