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PCA of time-series samples highlights similarities between most cell lines at early and late time points, respectively. (A) PCA for the R3 and R7 cell lines (analyzed by Affymetrix arrays). (B) PCA for the R1, R4, and R5 cell lines (analyzed by RNA-Seq). Time points corresponding to different stages of the cultures are color-coded: red, early; green, late; and blue, intermediate.
