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Fig. 7. AmphiTrk expression in the adult central nervous system. Pictures are lettered from most anterior (A) to most posterior (E) section. (A) The anteriormost limit of AmphiTrk expression is located at the beginning of the proper nerve cord, where strong signal is visible around the ventral part of the central canal (arrows). Coincidentally, some cells are labelled in both sides of the dorsal part of the neural tube (arrowheads), at the level where the primary motor centre initiates. (B) Section including the posterior part of the Hatschek's pit, showing AmphiTrk expression in the most dorsal part (asterisk). Arrows and arrowhead indicate AphiTrk-expressing cells in the ventral and dorsal compartments, respectively. (C-E) AmphiTrk expression is maintained along the neural tube around the ventral side of the central canal (arrows). Iteratively, some cells simultaneously express AmphiTrk in the dorsal part of the neural tube, albeit with a slight right-left offset (arrowheads). (F) At some points along the neural tube, AmphiTrk-expressing cells extend ventrally, touching the surrounding membrane of the notochord (arrows). N, notochord; NT, neural tube; HP, Hatschek's pit; HE, Hesse eyecup; DR, dorsal root.





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