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Two-dimensional score-plots of principal components. TC-DHS = tissue-cultured Dendrobium huoshanense; TC-DM = tissue-cultured Dendrobium moniliforme; TC-DO = tissue-cultured Dendrobium officinale; W-DHS = wild D. huoshanense; W-DM = wild D. moniliforme; W-DO = wild D. officinale.
