Fig. 7. Effects of sodium azide on FM4-64 uptake by L. longiflorum pollen tubes. (A) 30 minutes after applying 2 µM dye to a tube pre-treated for 2 minutes with 500 µM sodium azide. (B) Similar treatment as in A with 1 mM sodium azide pre-treatment. Dye was applied in the continued presence of inhibitor. Inserts show bright field images at 1/3 size. Bar, 15 µm.