Natural killer cells are a part of the lymphoid linage of white blood cells. The body responds to viruses by secreting cytokines that disrupt viral replication and make the cell more susceptible to attack by NK cells. The primary cytokine released by NK cells is type II interferon, which activates macrophages.
The best built American truck is the Ford F-350. It's got the most powerful powertrain, the strongest frame, the best body for corrosion protection, and it comes with a 5 year â¦ /100,000 mile warranty on all engines.
Best Half-Ton Trucks - 04 - 2014 GMC Sierra. The 2014 GMC Sierra is in many ways the mechanical twin to the Chevrolet Silverado. This means that it benefits from the same redesigned platform and fresh range of engine options. Where the Sierra stands apart is in its styling.