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Caspr and contactin mediate interactions between cells and paranodal loops of this structure. The Nogo-66 receptor binds to factors released after damage to this material, such as OMgp and MAG, to promote growth cone collapse. Low GALC production contributes to the loss of this substance in Krabbe's disease. It can be detected by staining with luxol fast blue. The major dense line of this substance is absent in shiverer mice due to a mutation in its namesake "basic protein." Saltatory conduction is facilitated by this substance, which is absent at the nodes of Ranvier (ron-vee-AY), and in the PNS it is produced by Schwann cells. For 10 points, name this substance that forms namesake "sheaths" on the surface of axons.
Caspr and contactin mediate interactions between cells and paranodal loops of this structure.
myelin sheath &lt;Belal&gt;