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Fig. 4. The germinal SP phenotype is related to ABC transporter activity. {alpha}6-integrin-positive cell fraction stained with Ho without inhibitor (A), with deoxyglucose plus sodium azide (B), 25 µg/ml (C) or 75 µg/ml of verapamil (D). (E) Bcrp1 expression analysis (35 cycles) in testicular subpopulations: SP cells (SP), tetraploid population (4n), upper diploid population (2n) and haploid population (n). {alpha}6-integrin-positive cell fraction stained with Ho without inhibitor (F) and with specific BCRP1 inhibitor Ko143 (G).