Okutsu M, Ishii K, Niu KJ, Nagatomi R. Cortisol-induced CXCR4 augmentation mobilizes T lymphocytes after acute physical stress. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 2005 Mar;288(3):R591–9. doi: 10.1152/ajpregu.00438.2004.