As AP‐1 subunit c‐Jun was shown to up‐regulate LGALS1 expression through AP‐1 site in lymphoma cells,12, 13 we examined the involvement of AP‐1, mainly composed of ATF, Fos and Jun family protein dimers, in IL‐1β‐stimulated LGALS1 expression in Müller glial cells. The gene discussed is FOS; the disease is lymphoma.