May be involved in intracellular vesicle traffic and potentially in calcium-dependent exocytosis in neuroendocrine cells. Binds to the C-terminal coiled coil region of syntaxin family members STX1A, STX3A and STX4A, but not when these proteins are complexed with SNAP25, VAMP2 or STXBP1, suggesting that it interacts with syntaxins that do not form the SNARE complex. Ubiquitous, with much higher expression in heart, kidney, liver and pancreas. Belongs to the taxilin family. Was originally thought to be a high molecular weight interleukin (IL-14 or IL14).