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Stimulation of motoneurons evokes large responses from Renshaw cells. Representative traces are shown for Renshaw cell responses to spike trains elicited from a motoneuron at extracellular calcium concentrations of 1 mm (A), 2 mm (B), and 4 mm (C). D, E, Group data for responses are represented for the mean current (Ī) and paired pulse ratio (PPR). F, Scatter distribution of the PPR against the mean current.
