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Fig. 1. APP-binding sites in embryonic chick brain. (A,B)
Binding of AP-APPs
versus AP control. Ventral view, E11.5-12.5 brains.
Prominent binding in optic tectum (OT, arrow), with additional staining in
olfactory bulbs (OB, arrowhead) and other regions. (C) AP-APPs
staining of tectum at greater magnification, showing anterior-posterior
striation characteristic of axons in the stratum opticum. Anterior-posterior
is horizontal. Scale bar: 100 µm. (D-F) Time-course of
AP-APPs
binding to brains. Dorsal view. Anterior (A) and posterior (P)
extremes of tecta. Arrows indicate posterior limit of staining. (G)
Binding of AP-APPs
to brain from embryo with single enucleated eye.
Ventral view. Staining in contralateral tectum (arrow) is reduced to
background levels. AP, alkaline phosphatase.