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(A) OPLS-DA score plot (Pp1 vs. Pp2) showing species separation (PG—P. ginseng (blue); PG—P. quinquefolius (green); PP—P. pseudoginseng (red) and ES—E. senticosus (yellow) and (B) prediction plot (Pp2 vs. Pp2) showing the relationships between the reference materials and the commercial products based on LC-MS data.
