Involved in cytokinesis. Acts as a cell plate-specific syntaxin, required for the fusion of vesicles at the plane of cell division. Interacts with SNAP33 and/or NPSN11 to form a t-SNARE complex and with KEULE. Abundant in flowers and developing siliques. A low level expression is seen in the seedlings, roots, and leaves. It is detected throughout embryogenesis until expression declines in mature embryo. During embryogenesis it is detected in patches of single cells or small cell groups. At or soon after the onset of mitosis. Belongs to the syntaxin family.