Figure 2.

Time lapse images showing the response of a growth cone to an NG2 cell and a MAG-CHO cell. A, Top panels, Response of a growth cone (arrow) to an NG2 cell (arrowhead). B, Bottom panels, Response of a growth cone (arrow) to a MAG-CHO cell (arrowhead). Scale bar, 10 μm. The growth cone did not retract or collapse after encountering an NG2 cell but formed a stable association that lasted over 1 h. In contrast, the growth cone that encountered a MAG-CHO cell retracted and ultimately collapsed.