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. 2021 Jan 28;14:573944. doi: 10.3389/fncel.2020.573944

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Copyright © 2021 Aboufares El Alaoui, Jackson, Fabri, de Vivo and Bellesi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Example of region of interest (ROI) showing an axo-spinous synapse with perisynaptic astrocytic process (PAP; blue), axon terminal (AxT), spine head (SpH), axon-spine interface (ASI, red), and relative 3D reconstruction. Scale bar: 400 nm. (B,C) Average ROI and PAP volumes, respectively. (D) Ratio between PAP and ROI volumes. (E) Average ASI size. (F) Percentage of synapses contacting the spine (spine+) and the synaptic cleft (ASI+). (G) Synaptic coverage as measured by the size of the interfacing surface between the PAP and the spine head. In panels (B–G) AC and SS refer to anterior cingulate and somatosensory cortex (paired t-test, n = 4).