Magna RX of the body. This substance is sometimes destroyed, in patients suffering from multiple sclerosis or after an injury. Of course, there is a mechanism of reparation, but it is not systematic. A French research team wanted to understand why. And it was thus that the "essential and unexpected" role of and its receptor was discovered. In mice, the absence of testes disrupts the spontaneous repair of myelin. The researchers explain this by the fact that the maturation of cells specialized in the synthesis of myelin (oligodendrocytes) is then defective. But why Strength Muscles? The answer lies in the origins of this hormone: the receptor that allows to act appeared at the same time as myelin, so very late in the evolution of vertebrates gnathostomes (with a jaw), which would explain " Their very strong link in the process of myelination ". "This may also be one of the reasons why the development of demyelinating .