Increased endogenous FADD in ES-MDS erythroid precursors. (A) Immunoblotting analysis of FADD in erythroid precursors from healthy controls (n = 5), ES-MDS (n = 5), and AS-MDS (n = 4) on culture day 10. (B) Densitometry analysis of FADD and tubulin immunoblots expressed as mean ratios ± SEM of FADD to tubulin expression in each group of patients.