Study shows egg-laying mammals have unique stomachs due to key gene inactivation
Egg-laying mammals, like platypuses and echidnas, have unique stomachs that are smaller than other mammals’. A gene called Nkx3.2 helps explain why their stomachs are different. This gene was found to be inactive in these animals’ common ancestor, which likely happened tens of millions of years ago. The team discovered this by studying genetic data … Read more