Figure 4

The PCA score plot of the toad toxin samples collected from twenty-two geographical origins. Each point represented an individual sample, and the points of the same color (blue or red) were similar in terms of bufogenins composition.
The PCA score plot of the toad toxin samples collected from twenty-two geographical origins. Each point represented an individual sample, and the points of the same color (blue or red) were similar in terms of bufogenins composition.