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Quantification of ABCB transcripts expression by qRT-PCR. Most notable among the ABCB family is PtaABCB1.1, which was highly expressed in internodes and developing xylem and whose ortholog in Arabidopsis (AtABCB1) has been demonstrated to transport auxin. Expression patterns of all PtaABCB genes are previously undescribed. Error bars represent the SEM.
