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Entrainment of bursting persists in the presence of cholinergic antagonists. A: disinhibited bursting recorded from the left L6 ventral root is entrained by stimulation (5 pulses, 4 Hz, 50 μA) of the adjacent L5 ventral root every 25 s (bicuculline 50 μM; strychnine 5 μM). When cholinergic blockers were added to the bath, the entrainment by ventral root stimulation persisted. B: the 2 bursts indicated by the boxed areas in A (a and b) displayed at an expanded time scale.
