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Negative feedback loops in auxin and cytokinin signaling responses in P. ginseng seedlings. Relative gene expression levels of type-A response regulators (A) and AUX/IAAs (B) in three-month-old P. ginseng seedlings treated with cytokinin and auxin, respectively, were quantified by a real time qRT-PCR (n = 4, Error bars indicate ± standard error).
