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Gel electrophoresis of RT-PCR-amplified COX-1 or COX-2 mRNA and their corresponding internal standard cRNAs (IS) in spinal cord (a and c) or pawpads (b and d) of WT and COX-1- or COX-2-deficient mice. Control (C) samples without RNA were used to verify that RT-PCR was free from contamination.
