Debating the origins of placental mammals; H. pylori-human coevolution; ant, bee, and wasp queens emit similar pheromones; profiling protein expression in single cancer cells A series of rodent ...

"This is the mother of all placental mammals," says Zhe-Xi Luo, a paleontologist at the Carnegie Museum of Natural History in Pittsburgh, proudly presenting a fossil of what resembles a pressed ...

What distinguishes one mammal from another is how it bears its young. Giraffes, lemurs, narwhals and humans are all placental mammals, gestating fetuses internally. Marsupials, such as kangaroos ...

Marsupials used to be considered an evolutionary stepping stone between egg-laying mammals called monotremes, such as platypuses, and placental mammals, such as humans, according to the new study.

This is similar to birth of placental mammals, when most babies require brown fat to regulate body temperature. During UCP1 transcription, many but not all genes commonly expressed in brown fat ...