Fig. 4.

Secretion of interleukin 6 (IL‐6) and interleukin 8 (IL‐8) from primary human conjunctival goblet cell (GC) cultures. Secretion is presented as mean concentration ± standard deviation after 30 min of incubation with polyquarternium‐1 (PQ)‐preserved Travatan and benzalkonium chloride (BAK)‐preserved Travoprost Stada. Travoprost Stada represents the BAK‐preserved generics. As a negative control GCs were incubated with culture medium. Secretion was measured on GCs from three individual donors using BD Cytometric Bead Arrays. No differences in cytokine secretion were identified compared to the control. Only p‐values <0.05 are shown.