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RAP assays with PTPσ FNIII deletion series. (A to J) RAP assays with PTPσ1-AP (A), PTPσ2-AP (B), FN1d-AP (C), FN2d-AP (D), FN3d-AP (E), FN4d-AP (F), FN5d-AP (G), FN6d-AP (H), FN7d-AP (I), and FN8d-AP (J) in the brachial spinal cord region of E10 chicken embryos. The arrowheads indicate basement membranes surrounding the spinal cord, the asterisks indicate skeletal muscle, and the arrow in panel B indicates associated tendon tissue. Scale bar = 1 mm.
