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Protein expression of GIRK2 and GIRK4 in six breast cancer cell lines. Top panel: GIRK2 expression was shown at the correct molecular weight (48–50 kDa) in ZR-75-1, MCF-7, and MDA-MB-468. Middle panel: GIRK4 expression was shown at the correct molecular weight (44 kDa) in all six cell lines. Bottom panel: GAPDH protein was detected in all samples.
