Principal component analysis of the pH-dependent ...

formed PCA. PCA of pH Titration Data. We performed a PCA of the pH titration data monitored by HSQC. Details are described in Materials and Methods and SI Fig. 9. As a result of the singular value decompo-sition, we obtained 13 PCs and corresponding contribution ratios. The accumulative contribution ratio of the first three PCs was 0.86 (SI Fig ... ................
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