β₂ integrins are required for skin homing of primed T cells but not for priming naive T cells
J. Clin. Invest. Stephan Grabbe, et al. 109:183 doi:10.1172/JCI11703 [Go to this article.]

Figure 4
DTH in CD18^–/– mice. Alloantigen-specific DTH was elicited by subcutaneous injection of 10⁸ spleen cells from BALB/c (H-2^d) mice into footpads of allosensitized CD18^–/– or control (H-2^b) mice, and footpad swelling responses were determined 24 hours later. *P < 0.001. Neg. C′, negative control.