In contrast, LCN2 deficiency was associated with increased bronchoalveolar lavage (BAL) levels of proinflammatory cytokines (i.e. IL12, interferon [IFN]γ, IP-10, IL6, MCP-1, BAFF and IFNα) three days after influenza infection (S1F Fig). Here, TNFSF13B is linked to influenza.