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 5
Irritant dermatitis in CD18^–/– mice. Irritant dermatitis was elicited by application of 10 μl 0.8% croton oil to both sides of one ear, and measurement of ear swelling responses (a) and histological examination (b) were performed 18 hours later. Arrows indicate dilated blood vessels with endothelium-associated leukocytes, some of which appear to have extravasated. Original magnification, ×200. *P = not significant.