Myelin does a lot more than just make longer axons possible. For instance it might have impact on learning and memory [0]. It’s cool that yet again our cells have co-opted useful genes from viruses long gone similar to how a very defining feature of being a mammal (the placenta) relies on a virus gene[1]<p>Biology is just fascinating.<p>0:<a href="https://www.science.org/doi/10.1126/science.aba6905" rel="nofollow">https://www.science.org/doi/10.1126/science.aba6905</a>
1: <a href="https://pubmed.ncbi.nlm.nih.gov/10693809/" rel="nofollow">https://pubmed.ncbi.nlm.nih.gov/10693809/</a>