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. 2022 Feb 9;42(6):1068–1089. doi: 10.1523/JNEUROSCI.1724-21.2021

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Figure 12. — Quantitative ultrastructural features of pathways from hippocampus, A25, and amygdala to the nucleus reuniens. A, Histogram depicts distribution of major diameter for hippocampus (case BQ, Alexa488), and mean distribution for A25 (BR, BDA tracer; BS, LY tracer) and amygdala (BW, FR tracer; BQ, CBL tracer) axonal terminations in RE from serial EM. B, Major diameter by pathway as measured in photomicrographs from serial EM using color legend from A. Open circles indicate individual case values (A25 top, BR, BDA tracer, n = 47 boutons; A25 bottom, BS, LY tracer, n = 51; Amy top, BW, FR tracer, n = 32; Amy bottom, BQ, CBL tracer, n = 60; Hipp top, BU, CBL tracer, n = 7; Hipp bottom, BQ, Alexa488 tracer, n = 58 with histogram in A). C, Percentage of synapses formed from A25, amygdala, and hippocampus terminations on dendritic thorns or shafts of postsynaptic targets in RE. Open circles indicate individual case values (A25 top, BR, BDA tracer, n = 57 synapses; A25 bottom, BS, LY tracer, n = 52; Amy top, BW, FR tracer, n = 35; Amy bottom, BQ, CBL tracer, n = 64; Hipp top, BU, CBL tracer, n = 12; Hipp bottom, BQ, Alexa488 tracer, n = 66). D, Percentage of boutons that contained mitochondria per pathway. Open circles indicate individual case values (A25 top, BR, BDA tracer, n = 55 boutons; A25 bottom, BS, LY tracer, n = 55; Amy top, BQ, CBL tracer, n = 35; Amy bottom, BW, FR tracer, n = 65; Hipp top, BU, CBL tracer, n = 9; Hipp bottom, BQ, Alexa488 tracer, n = 59). E, Percenaget of synapses formed by tracer-labeled axonal terminations per pathway in RE that were perforated. Open circles indicate individual case values (A25 top, BR, BDA tracer, n = 58 synapses; A25 bottom, BS, LY tracer, n = 58; Amy top, BQ, CBL tracer, n = 64; Amy bottom, BW, FR tracer, n = 35; Hipp top, BU, CBL tracer, n = 12; Hipp bottom, BQ, Alexa488 tracer, n = 66). F, Percentage of tracer-labeled boutons per pathway that formed multiple synapses. Open circles indicate individual case values (A25, BR, BDA tracer, n = 53 synapses; BS, LY tracer, n = 51; Amy, BQ, CBL tracer, n = 45; BW, FR tracer, n = 29; Hipp top, BU, CBL tracer, n = 9; Hipp bottom, BQ, Alexa488 tracer, n = 59). Amy, Amygdala; CBL, Cascade Blue; FR, Fluororuby; hipp, hippocampus; LY, Lucifer yellow.