Correspondence analysis of microarray samples. Correspondence analysis was performed on gene intensity signals measured on a subset of 22 individuals. Circles represent females; triangles represent males. Time points are colored as follows: orange = Day 1; green = Day 14; blue = Day 28; black = Day 90; pink = Day 180. Outliers are numbered (Subjects 121 and 174). Subject 174 died prior to Day 180; therefore, that sample was not available for analysis. The three axes displayed explain 32% of the variance of the whole dataset. Each data point on the graph represents a projection of the expression profile (34,573 probe sets in this case; see materials and methods for filtering of the data set) of one subject at a single time point. The distance between subjects reflects the distance between their entire gene expression profiles.