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.
Next Winner 2018 Ford F-150 For four years straight, the Ford F-150 has taken the pickup truck honors in our Best Buys competition. And, for four years straight, nobody else has come close to toppling it. There are many reasons for this. Ford's move from steel to aluminum now seems prescient.