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Scores plot (A) from PCA using ToF-SIMS data collected from the RAs of post-hatch day 20, 40, and adult male zebra finches. Three different males from each age group were used, and five different spectra were collected from each RA. Ellipses are 95% confidence intervals. Loadings plot (B) shows the masses responsible for the distribution of the different aged RAs in A.
