Purnell Choppin, a physician, virologist, and scientific administrator who performed pioneering research on viruses at The Rockefeller University and later exerted a powerful influence on biomedical research as president of the Howard Hughes Medical Institute, has died at the age of 91.
Our brains have sensory cells, which process the faces that we see, and memory cells dedicated to storing data from person encounters. But until now, a hybrid neuron capable of linking vision to memory—and explaining how we recall familiar faces—remained elusive.
Whenever a cell uses CRISPR to defend itself, there's a chance of mutations creeping into its genetic code. Some of these mutations are harmless; others kill the cell. But fortuitous mutations can occasionally render major human pathogens, such as Staphylococcus aureus, antibiotic resistant.