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(A) Eight-cell Strongylocentrotus purpuratus embryos exposed to the indicated probes [calcein-AM (CAM), bodipy-FL verapamil (BFLV) and calcein red/orange-AM (CROAM)] exhibit increased fluorescence in the presence of maximally effective levels of the transporter inhibitors PSC833 and MK571. Scale bar, 20 μm. (B) The same embryos under brightfield imaging.
