After digesting a pathogen, a macrophage will present the antigen (a molecule, most often a protein found on the surface of the pathogen and used by the immune system for identification) of the pathogen to the corresponding helper T cell.
The Federal Communications Commission could be throwing a wrench in Verizon Communicationsâ strategy for offering super-fast upcoming 5G wireless service in the next few years. The strategy depends in part on Verizon $1.8 billion deal to acquire XO Communicationsâ national fiber optic network and lease rights to XOâs high frequency airwave rights. But this week, the FCC said it was pausing its usual 180-day review period for evaluating the deal with XO, owned by billionaire investor Carl Icahn, after many of Verizonâs competitors complained.
Yahoo's first acquisition was the purchase of Net Controls, a web search engine company, in September 1997 for US$1.4 million. As of April 2008, the company's largest acquisition is the purchase of Broadcast.com, an Internet radio company, for $5.7 billion, making Broadcast.com co-founder Mark Cuban a billionaire.