Figure 6. Stellate cell axons lack NMDARs.

(A) Axonal (left box) and dendritic (right box) locations of L-aspartate iontophoresis on a stellate cell. (B) Frame-scan sequence shows a dendritic Ca²⁺ transient evoked by dendritic iontophoresis. (C) Action potential stimulation (top) reveals hot spots of Ca²⁺ entry in an axon segment. Frame scans taken during iontophoresis (bottom) onto the same axon segment. (D) Quantification of frame scans of dendritic (B) and axonal segments (C- lower varicosity) during L-aspartate iontophoresis.