TPO quantification in plasma.

Each point is the mean ± SD of 12 to 14 animals, with the exception that only 6 TGF-β1^−/− animals were analyzed at week 16. ● represents TGF-β1^+/+ (WT) transplant; ■, TGF-β1^−/− (–/–) transplant. Results of statistical analysis with the 2-tailed Student t test: WT versus TGF-β1^−/−, ^★P < .05 and^★★P < .001.