- ⇪ Pleistocene Megafaunal Collapse, Novel Plant Communities, and Enhanced Fire Regimes in North America⇪ A new transitional sauropodomorph dinosaur from the Early Jurassic of South Africa and the evolution of sauropod feeding and quadrupedalism⇪ Adenovirus vector vaccination induces expansion of memory CD4 T cells with a mucosal homing phenotype that are readily susceptible to HIV-1