The cover image is a volcano plot showing the overall result of the data analysis. Each spot represents a gene. The color intensity represents the level of gene expression (red, up-regulated; green, down-regulated; yellow, equally expressed in labouring placentas compared to non-labouring placentas).Genes positioned in the two upper-lateral quadrants would be both biologically and statistically differentially expressed (See Sitras et al., pp. 61-65).
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