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. 2014 Aug 15;8:81. doi: 10.3389/fnana.2014.00081

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Copyright © 2014 Balaram and Kaas.

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) or licensor 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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VGLUT2 immunoreactivity reveals the continuation of layer 4, but not layer 3Bβ, at the boundary of V1 into V2 across (A) chimpanzees, (B) macaque monkeys, (C) squirrel monkeys, (D) marmosets, (E) owl monkeys, (F) galagos, (G) mouse lemurs, and (H) tree shrews. Hässler’s laminar designations are listed on each panel for both visual areas. Arrowheads demarcate the V1/V2 border, V1 is to the left of the arrowhead and V2 is to the right of the arrowhead in each panel. Black lines indicate laminar boundaries and white lines indicate sublaminar boundaries in each area. Individual panels are scaled relative to V1 of chimpanzees to visualize laminar transitions between V1 and V2 across species.