TMEM119 is known as a microglia-specific and robustly expressed trans-membranous molecule, which is not expressed by other macrophages and immune or neuronal cells, and forms, therefore, the most promising microglia marker to date. TMEM119 has served as a reliable immunohistochemical microglia marker for neurodegenerative diseases since then and was recently stained by an adapted protocol for immunocytochemistry even in postmortem CSF samples of trauma cases.