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.
This year's list is especially distinctive because it is the first time in four years that a domestic automaker takes the #1 spot for Most American, even though the list is a fairly even split between foreign-owned automakers and domestic-owned automakers. Here are the 7 Most Made in America Cars: 7. Toyota Tundra. Toyota Motor's (NYSE:TM) Tundra comes in at No.7 on the list. Assembled in San Antonio, Texas, the Tundra represents one of the two full-sized pickup trucks that make the American Made index.