T cells are white blood cells that are important for adaptive immunity. They have unique cell surface receptors that are generated by randomly assorting genes. These receptors allow T cells to sense ...

AT&T Inc. AT&T, Inc. is a holding company, which engages in the provision of telecommunications and technology services. It operates through the Communications and Latin America segments. The ...

AT&T also has a sizable presence in Mexico, with 25 million wireless customers, but this business only accounts for 3% of revenue. The company recently sold its 70% equity stake in satellite ...