Distinct expression of T-cell cytokines and chemokine ligands/receptors in GVHD skin lesions. (A-B) Quantitative real-time RT-PCR was performed after TRIzol lysis of lesional skin biopsies of aGVHD, clGVHD, and csGVHD patients. Data are normalized to β₂m of each specimen and represent the mean ± SD of fold change (log₂) in mRNA expression relative to normal skin (n = 10). *P < .05, **P < .01, ***P < .001.