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Fig. 4. Light micrograph of a stage-9 ovariole with corresponding extracellular H+ fluxes superimposed. H+ flux is indicated by red vectors, with length proportional to the flux magnitude. Vector angles are the result of summing x- and y-axis measurements. Vectors traveling away from the ovariole surface represent H+ efflux; vectors traveling over the ovariole are influx. The noise measurement is in the bottom left corner. Of interest is the H+ efflux near the forming chorion rim in late vitellogenic oocytes (asterisk), which remains throughout choriogenesis. Red scale bar, 100 fmol cm–2 s–1; black scale bar, 100 µm.





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