"Yeah, I understand you paid me to do this, but still yet, I put my life on the line for you, I put my health on the line," Dorsett told The Associated Press just before the Super Bowl. "And yet when the time comes, you turn your back on me? That's not right. That's not the American way.".In the language of physics, the externally rigid nature of the helmet means that when two helmets collide the collision tends to be "elastic", no energy is lost to deforming the helmet; it all goes into imparting new velocity to the skulls inside the helmet. This is exactly opposite of what is desired. To visualize the inelastic extreme, imagine players colliding head to head with large sponges on their heads rather than today's footballs helmets.

Neurofascinspecific antibodies can also inhibit remyelination by binding to NF155 expressed on the surface of oligodendrocytes.Gangliosides Another group of neuronal antigens includes the gangliosides, which are gl