Fig. 3

PCA of young and old in BSU cohort, before and after exercise. Principal component analysis of the 249 common transcripts changed in old Oslo and old BSU cohorts at q-value < 0.1 (Table S1). The plot includes those transcripts analyzed in old people (red color) or young people (blue color) of the BSU cohorts before (squares) and after (balls) the strength training period. Each symbol represents one person depicted as one average transcript signal value of the 249 transcripts (Table S1). The main differences in gene expression are located along the x-axis while minor differences are located along the y- and z-axes. A faint colour indicates that the symbol is placed somewhat back along the Z axis