The KMC8 monoclonal antibody specifically binds to CD9 which is also known as Tetraspanin-29 (Tspan29)
CD9 is a 24-kDa member of the transmembrane 4 superfamily, also called the tretraspanin family
In the mouse, CD9 is present on bone marrow myeloid cells, stromal cells, and megakaryocyte-committed progenitors; subsets of peripheral T and B lymphocytes; and neutrophils, platelets, dendritic cells, and bone marrow-derived macrophages
CD9 has been found to be associated with integrins and other cell-surface receptors
It appears to play roles in signal transduction and in regulating cellular adhesive properties
CD9 can also reportedly participate in T-cell costimulation and induction of apoptosis
The KMC8 antibody reportedly blocks certain CD9 functions and activates macrophages.