Figure 4.

Immune response after cage switching in aged and young mice. Granulocyte count in peripheral blood (A), numbers of neutrophils recruited to the cecal tissue (B), and cecal cytokines—KC (C) and interleukin (IL)-1β (D)—were measured. (The rest of the cytokine responses are shown in Supplementary Figure 5.) Student’s t test was used to compare young and aged mice at each time point (*P < .05).