RASFC cultures from different patients (n = 6 compounds 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23; n = 3 compounds 21, 24, 25, 26) were treated with TNFα (10 ng mL−1) in the presence of controls or queuine analogues at a concentration of 200 μm. Culture media was replaced after 24 h and fresh media and compound were added. Cell supernatants were collected at the 72 h time point and tested for IL-6 secretion by ELISA. DMSO (4% in PBS), Tofacitinib (Xeljanz – Pfizer, Janus kinase inhibitor, 1 μM), IgG isotype antibody (1 μM) and Adalimumab (Humira – Abbvie, anti-TNF monoclonal antibody, 1 μM) served as experimental controls.