In contrast, the frequency of Th17 cells in the lung (Fig 4A), as well as the production of IL-17 by CD4+ T cells (Fig 4B), was significantly higher in the lungs of mice with neutrophilic (CFA/OVA) than with eosinophilic (Alum/OVA) asthma. The gene discussed is CD4; the disease is asthma.