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Effects of Sr2+ and botulinum toxin on stimulation-induced changes in NADH and Ψm The stimulation-induced decrease in NADH autofluorescence and partial depolarization of Ψm persist when bath Ca2+ is replaced by 2 mm Sr2+ (A and B), and when transmitter release is blocked by 40 nm BoTxA (C and D). Records in A and C were recorded sequentially from the same terminal, and records in B and D from another terminal. n = 3 experiments for A–Cn = 1 experiment for D.
