How are the brains of humans and monkeys different from other animals? It is logical that the structure. What makes the brains of primates line up in a certain pattern, which is different from that of mice? Again, it is obvious that gene expression. And what genes? Good question. The latest issue of Nature talks about one of them - osteocrine (OSTN). The most amazing thing is that this gene is present in both mice and humans, but in mice it affects the circulation of glucose in bones and muscles, and in humans, over millions of years of evolution, its function has been reorganized to regulate the development of the cerebral cortex.