We've got to get beyond the knee-jerk reaction that LASIK isn't appropriate for any patient under 18 years of age, said Davidorf. The subtext is that Hahn wanted to get rid of the embarrassment of airport officials' knee-jerk reaction that it's OK to snub the Valley by trampling on one of its beloved traditions.
Natural killer cells, or NK cells, are a component of the innate immune system which does not directly attack invading microbes. Rather, NK cells destroy compromised host cells, such as tumor cells or virus-infected cells, recognizing such cells by a condition known as missing self..
When your body is attacked â perhaps by a virus or other germs â your immune system defends you. It âseesâ and kills the germs that might hurt you. But when the system doesnât work right, this process can cause harm. Immune cells can mistake your bodyâs own cells as invaders and attack them.