To do so, we applied a competitive T cell chimera tracing strategy based on transfer of equivalent numbers of CD45.2+ splenic T cells isolated from green fluorescent protein (GFP) expressing WT mice and GFP-Lcn2-/- mice into CD45.1+ WT recipients, and subsequent influenza infection (2 days after transfer, Fig 3F). The gene discussed is LCN2; the disease is influenza.