"Work from our lab previously had shown that the platypus and echidna had lost the genetic instructions for proteins that break down food and secrete stomach acids, but to me this didn't explain ...

Scientists in Australia have made an exciting discovery—a 15-million-year-old fossilized freshwater fish that not only provides clues about ancient life but also has preserved stomach contents and ...

while vsig1 codes for controlling stomach development. In addition, the researchers found that agastric egg-laying mammals, ...