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Fig. 1 | BMC Medical Genomics

Fig. 1

From: Differential expression analysis of human endogenous retroviruses based on ENCODE RNA-seq data

Fig. 1

Principal component analysis of normalized HERV expression values in 25 ENCODE RNA-Seq data sets. The first, second, third, and fourth principal components account for 19.06 %, 10.30 %; 5.70 %, and 5.01 % of the variance, respectively. Each data point represents one replicate. Circles: normal cell lines; squares: cancer cells; filled symbols: CSHL samples; empty symbols: Caltech; crosses in the symbols: single-end sequencing. a The first component separates single- and paired-end libraries, while the second separates ESC samples from all the others. b The third component separates K562 from the other cell types. c The fourth component divides samples into normal and cancerous cell types

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