Figure 1. Background correction and normalization of differential genes in alcoholic liver disease. (A) PCA mapping of differential genes in alcoholic fatty liver samples compared with normal samples. (B) Normalization of differential genes in alcoholic fatty liver samples compared with normal samples. (C) PCA mapping of differential genes in alcoholic hepatitis samples compared with alcoholic fatty liver samples. (D) Normalization of differential genes in alcoholic hepatitis samples compared with alcoholic fatty liver samples. (E) PCA mapping of differential genes in alcoholic cirrhosis samples compared with alcoholic hepatitis samples. (F) Normalization of differential genes in alcoholic cirrhosis samples compared with alcoholic hepatitis samples.