This included genes such as cytokine‐like interleukin 12 receptor beta 2a (ilrb2a), which stimulates interferon‐γ production from T cells and NK cells (Fujiwara et al. 2003); M17, a subfamily cytokine with similarities to mammalian IL‐6 that induces macrophage activation in goldfish (Hanington and Belosevic 2007); and mpeg1.2, an antibacterial gene induced by infection (Benard et al. 2015). The gene discussed is IL6; the disease is infection.