Expression of C/EBPϵ in the SGD patient. (A) Real-time PCR analysis of C/EBPϵ expression in a normal sample and in the SGD patient was carried out in triplicate. Transcript levels were normalized to that of β-actin and expressed as a ratio of the signal observed in the normal sample (1). Error bars indicate standard error of the mean (SEM). (B) Western blot analysis of normal and SGD PMNs. NB4 and NB4 cells treated with ATRA serve as an additional control for C/EBPϵ expression.