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.
North America's largest truck camper manufacturer is Lance Camper Manufacturing Corporation of Lancaster, California, followed by Arctic Fox of La Grande, Oregon. Lance's most popular model is the Lance 825. Truck campers continue to be most popular in the Western United States and Canada, and this is where most manufacturers are headquartered.