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Table 1. Upregulation of expression levels of !-opioid receptor in DRG of MK-/- mice compared to
WT+/+ mice. The Affymetrix MOE 430A chip was used to measure simultaneously the expression levels
of 14,400 genes. Total RNA isolated from three spinal cords and DRG corresponding to L4 and L5 spinal
nerves of each genotype was used for this study. The values show the result of the ratio of the expression
intensities of each gene in MK-/- vs. WT+/+ mice (“~ 1” is used when the result of the ratio performed
was 1 ± 0.5).

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