Alligator Stem Cell Study Gives Clues To Tooth Regeneration “Alligator teeth are implanted in sockets of the dental bone, like human teeth,” said Ping Wu, assistant professor of pathology at the Keck School and first author of the study. “They have 80 teeth, each of which can be replaced up to 50 times over their lifetime, making them the ideal model for comparison to human teeth.”
Known as Thylacosmilus atrox, this animal looked and behaved like nothing alive today. Its closest living relatives are the Australian and American marsupials. Thylacosmilus atrox had larger teeth proportionally to its body in comparison with saber-tooth tiger Smilodon fatalis, making it one of the more interesting saber-toothed animals to study. These animals were separated by at least 125 million years of evolution.
Shock-Absorbing ‘Goo’ Discovered In Bone Stops Them From Shattering New findings show that much of the mineral from which bone is made consists of ‘goo’ trapped between tiny crystals, allowing movement between them. It is this flexibility that stops bones from shattering.