As previously described 7 (link),8 (link),33 (link), mice were immunized with an intraperitoneal injection of 10 mg ovalbumin (OVA) (Sigma-Aldrich, St. Louis, MO, USA) in 300 ng pertussis toxin (Sigma-Aldrich) and 1 mg aluminum hydroxide (Thermo Fisher Scientific, Waltham, MA, USA) in PBS. After a 14 day rest period, mice were given topical application of 250 mg OVA solution (i.e. OVA challenged) once/day to each eye for at least 7 days. Naïve mice did not receive the OVA challenge.