Mast cells (MCs) are tissue-resident immune cells and are responsible for allergic and inflammatory processes. One potential approach for targeting MCs is to engage inhibitory receptors that can silence MC activation, such as sialic acid-binding immunoglobulin-like lectins (siglecs). Siglec-6 is an inhibitory receptor expressed on human MCs and represents an attractive therapeutic target for this purpose. Siglec-6 engagement with a monoclonal antibody (MAb) was recently shown to inhibit MC activation in vitro.