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.
Midsize Truck: Toyota Tacoma. According to Edmunds, the Toyota Tacoma is the truck that is projected to best hold its value after five years of ownership in the midsize pickup category. Competitors to the Tacoma's reign of sales success include the Chevy Colorado and GMC Canyon.