sentences:  One way this process can be traced is by following different protein activation sequences which have shown just how quickly remyelination begins after injury (within a few of days).The most notable evidence that remyelination has taken place on an axon is its thin myelin sheath created by an oligodendrocyte, though the reason why the new myelin sheath is thinner remains unclear.This can be quantified in the g-ratio, the ratio between the diameter of the axon itself to the outer diameter of the myelinated fiber.