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. 2019 Mar 27;39(13):2416–2429. doi: 10.1523/JNEUROSCI.3068-18.2019

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Copyright © 2019 Gratz et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License Creative Commons Attribution 4.0 International, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Figure 3. — Cac^sfGFP-N is heterogeneously distributed and highly correlated with P_r at individual AZs. A, Confocal Z-projection of a cac^sfGFP-N NMJ labeled with an antibody against GFP. B, Broad distribution of Cac intensity across motorneuron AZs [n = 3067 AZs (10 data points are outside the x-axis limits shown) from 16 NMJs of 4 animals]. C, Confocal Z-projection of Cac^TagRFP-N superimposed on a single frame of a PS-GCaMP movie monitoring neurotransmission in a live cac^TagRFP-N; PS-GCaMP preparation. D, Schematic of release events detected through postsynaptic GCaMP imaging (green dots) during 1 Hz stimulation mapped to individual AZs marked by Cac^TagRFP-N (magenta dots). E, Heat map indicating P_r and Cac intensity at each AZ by spot size and color, respectively. F, Correlation between Cac and P_r at a single NMJ (NMJ D, shown in C–E; r = 0.80, n = 44 AZs). G, Correlation between Cac and P_r at six NMJs in six larvae (average r = 0.74).