Humans and chimpanzees diverged from a common ancestor about 6 million years ago. According to a study published
Scientists have studied the human genome in search ofevidence of the “birth” of completely new genes. In particular, they looked for so-called de novo genes. They spontaneously arise from fragments of DNA that do not code for proteins, but for molecules that turn genes on and off or perform other functions in the cell. They seem to be designing code from scratch, rather than iterating the protein-coding DNA that already existed in the cell.
In a new study, scientists found 155created from scratch human genes that code for tiny proteins or microproteins, many of which are less than 100 amino acids, the building blocks of proteins. And two of them are especially specific to humans. As the scientists explain, they did not appear in any of the other studied animal genomes. They appeared after humans split from chimpanzees.
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