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Spatiotemporal characterization of bitter-tastant-evoked calcium responses in mouse male germ cells: traces of calcium responses from acrosome (A), midpiece (M) and principal piece (P) of a spermatid (left) and epididymal sperm (right) to 200 µM bitter-tastant mixture (BTM) or individual bitter tastants: procainamide, denatonium, PTC, PROP and cycloheximide. Insets: Fura-2/AM-loaded spermatid (left) and epididymal sperm (right).
