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. 2018 Oct 17;8:15314. doi: 10.1038/s41598-018-33686-3

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Tdc2-Gal4-positive arborizations in the thorax. Projections of optical sections visualizing the arborization pattern of Tdc2-Gal4-positive (Tdc2Ns; A–N,Q,R) and Tdc2-positive (O,P) neurons (black or green) in the thorax. (A) Tdc2Ns run through the cervical connective (CV) and corpora cardiaca nerve (NCC). (B) Tdc2Ns arborize close to the corpora allata (CA) and the anterior stomatogastric ganglion (white-rimmed). (C–F) Tdc2Ns project along the legs and innervate leg muscles. (G) An afferent sensory neuron in the third segment of the tarsus (Ta). (H–J) Cell bodies of sensory neurons (asterisks) of the trochanter (Tr; H) and tibia (Ti; I,J). (H) Neurons of the chordotonal organ in the femur (Fe; arrowhead). (K–M) Tdc2Ns project along the wing nerve (WN). (K) Innervation of the thoracic chordotonal organ (asterisk). (L,M) Tdc2Ns run along the L1 wing vein. Cell bodies of sensory neurons are visible (asterisks). (N–R) Tdc2Ns in the haltere nerve (HN). (O,P) anti-Tdc2-positive cells project to the distal part of the capitellum (cap). (Q,R) Sensory neurons of the pedicellus (ped) and scabellum (scb) are labeled by Tdc2-Gal4 and Tdc2 antibody (O). (S,T) Schematic drawing of a fly and one leg visualizing the VNS and peripheral nerves (dark grey), CA (dark green), leg muscles (light green) and sensory neurons (purple) shown in A–R. (A–J,N–R) sagittal sections; (K) horizontal sections; (L,M) frontal sections. A, abdominal segment; Co, coxa; ES, esophagus; LN, leg nerve; PV, proventriculus; SEZ, subesophageal zone; T1–3, thorax segment1–3; thx, thorax. Scale bars: A–G,K–R = 50 µm; H–J = 25 µm.