Fig. 3

Principal component analysis on NEC and EC samples of CCRI 12 and CCRI 24 (bad correlative duplicates were removed). NEC samples of CCRI 12 and CCRI 24 were divided clearly into two clusters, while EC samples of CCRI 12 and CCRI 24 mingled. PC1 stands for principle component 1, and PC2 stands for principle component 2