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. 2012 Sep 17;198(6):1075–1091. doi: 10.1083/jcb.201204024

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© 2012 Kashikar et al.

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Figure 4. — Sperm encode periodic stimuli. (A and B) Ca²⁺ (A) and V_m (B) signals upon repetitive stimuli of cGMP (25% flash; Δt = 1 s). (A, inset) Plot of peak amplitudes of Ca²⁺ rises after each flash. The Ca²⁺ signal amplitude after the first flash was taken as 1, and subsequent amplitudes were normalized (n = 6). (C) Superposition of Ca²⁺ drops as in A. Each trace represents the flash depicted in A. Flash number: second (red), third (green), fourth (blue), fifth (cyan), sixth (magenta), seventh (yellow), and eighth (dark yellow). Ca²⁺ drops were aligned to the time of the respective flash. (inset) Slope of Ca²⁺ rise after the drop after each flash (n = 6). Error bars are SDs. (D) Superposition of V_m signals as in B. Flash number: first (cyan), second (black), third (red), fourth (blue), fifth (green), sixth (magenta), seventh (dark yellow), and eighth (navy). For superposition, signals were aligned to the time of the respective flash. (inset) Plot of V_m amplitude (Δ(ΔR)) after each flash. To compare across different trials (n = 5), ΔV_m after the first flash was taken as 1, and subsequent amplitudes were normalized. Arrows indicate time of flashes.