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" ... On the one hand, this is remarkable. We had an event occur some 130 million light-years away: far enough away that light took 130 million years to travel from the galaxy where it occurred to our eyes. Back when the merger took place, planet Earth was a vastly different place. Feathered birds had been around for only 20 million years; placental mammals for 10 million. The first flowering plants were just beginning to emerge, and the largest dinosaurs were still 30 million years in Earth's future. ... "
" ... One potential use for placental cells: improving the odds when transplanting bone marrow stem cells into patients with the blood cancer multiple myeloma, a standard treatment. Celularity aims to mix in a type of cell called a natural killer cell, taken from its placenta stores. “Preliminary first in humans suggest they had very good responses with more people achieving a complete remission,” says Sergio Giralt, Chief, Adult Bone Marrow Transplant Service at Memorial Sloan Kettering Cancer Center and a consultant to Celularity. “I was skeptical. I thought they would enhance responses to a certain degree.” He cautions that the results, in a small number of patients, are still early. ... "
" ... Some 95 million years ago, an evolutionary split occurs among the placental mammals, giving rise to the laurasiatheres (horses, pigs, dogs, bats, etc.), the xenarthra (like anteaters and armadillos), the afrotheres (such as elephants and aardvarks), and the euarchontoglires (including primates, rodents, and lagomorphs). 75 million years ago, another split occurred, as the ancestors of modern primates split off from the remaining euarchontoglires; the rodents will become the most successful, eventually making up 40% of all modern mammals. ... "
" ... The group of mammals that contains placental mammals (like us) and marsupials is called Theria. The rise of therians is often assumed to have been suppressed by competition with larger dinosaurs before 66 million years ago. Mammals were seemingly small before the Cretaceous-Paleogene extinction event, and not so diverse taxonomically. But when paleontologists began to use more quantitative approaches to examine the size and shape of early mammal fossils, especially their teeth, the story began to shift. ... "