| CCA | canonical correlation analysis |
| DOPA | dihydroxyphenylalanine |
| GRDA | grey relational analysis |
| HPLC | high performance liquid chromatography |
| MS | mass spectrum |
| PE | total ethanol extract of P. corylifolia |
| PCA | principal component analysis |
| PLSR | partial least squares analysis |
| UPLC | ultra performance liquid chromatography |
| TYP | tyrosinase |
| TCM | traditional Chinese medicine |
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