Figure 2

Principal component analysis (PCA) biplot analysis for caecum microbiota analysed by gut low-density array (GULDA). Each PCA biplot was generated using two groups. Black filled circle―CON (control), red filled circle―UV (exposure to single UV stress without supplementation), green filled circle―GU (7-day green tea extract supplementation followed by single UV stress), blue filled circle―EU (7-day EGCG supplementation followed by single UV stress), brown filled circle―CU (7-day caffeine supplementation followed by single UV stress), purple filled circle―TU (7-day theanine supplementation followed by single UV stress). Quantitative caecum microbial community comparison of bacterial taxa derived from GULDA. Ratio (log2) of the relative abundance of selected 16S rRNA gene targets in caecum from each group to that of the CON group.