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Camera lucida drawings of the optic fibre arborizations in layer 7 of the optic tectum. (a) Golgi-impregnated arborizations from a 1-month-old chick. (b) BDA-labelled arborizations from a 3-week-old chick. (c) Golgi-impregnated arborizations from a 1-day-old chick. (d) BDA-labelled arborizations from a 3-week-old chick.
