Testing thousands of RNA enzymes helps find first ‘twister ribozyme’ in mammals

Testing thousands of RNA enzymes helps find first ‘twister ribozyme’ in mammals

The “RNA world” hypothesis proposes that the earliest life on Earth may have been based on RNA — a single-stranded molecule similar in many ways to DNA — like some modern viruses. This is because, like DNA, RNA can carry genetic information, but, like a protein, it can also act as an enzyme, initiating or … Read more

How mammals got their stride

How mammals got their stride

Mammals, including humans, stand out with their distinctively upright posture, a key trait that fueled their spectacular evolutionary success. Yet, the earliest known ancestors of modern mammals more resembled reptiles, with limbs stuck out to their sides in a sprawled posture. The shift from a sprawled stance, like that of lizards, to the upright posture … Read more