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(a–c) Photomicrographs at increasing magnification of type 2 (r2) radial neurons from 1-month-old chick optic tectum, labelled with PHA-L. Labelled axons are indicated (ax) and dendritic side branches (d sbr) can be seen in layer 7 (L7). Their perikarya are located in layers 10–11 (L10, L11).
