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Inhibition of p-glycoprotein (PGP) expression and reverse of multidrug resistance (MDR) phenotype in KB-8-5 cells by synthetic 21-bp double-stranded oligoribonucleotides were investigated. siRNA constructs for the efficient down regulation of MDR1 that are active in nanomolar concentrations and cause reversal of MDR phenotype in cells were developed.
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Logashenko et al. (2004) studied this question.
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