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Quantification of commonly expressed genes encoding soluble or membrane proteins in various human tissue samples using real time RT-PCR. The expression levels of two polytopic membrane protein genes (panel A and B) and two soluble protein genes (panel C and D) in eight human tissue samples known to express ABC transporters were evaluated using RT-PCR. A) ATP1A1; B) PMCA4; C) GAPDH; and D) HPRT1. The error bars represent standard deviation (n = 4).
