Figure 1
From: Gene Expression Profiles in Alveolar Macrophages Induced by Lipopolysaccharide in Humans
Principal component (PC) analysis mapping of the samples from the whole microarray data. The color indicates the different groups (blue: saline samples; red: LPS samples) and ellipsoids are drawn around each group. (A) From the eight subjects, the total variation explained by PCs 1, 2 and 3 is 55%. Overlap is formed around saline and LPS samples. (B) From the seven subjects, the total variation explained by PCs 1, 2 and 3 is 57.5%. Clear clusters are formed around saline and LPS samples.