Fig. 1: Principal component analysis (PCA) of gene expression data.
From: The effects of space radiation on the transcriptome of heart right ventricle tissue
Scatter plot of the first two principal components from PCA of normalized gene expression data. Each dot represents a sample colored by sex and radiation exposure type. The primary source of variability in gene expression is associated with sex differences. Male experimental groups (yellow, orange, and purple dots) are located in the upper right side of the plot and display a wider spread, indicating greater expression variability. In contrast, female groups (green, blue, and red dots) are more tightly clustered and located on the left side of the plot.
