The most important function of immune system is to defend the body from different disease causing pathogens. Whenever there is pathology in human body, immune system is activated to protect the vital tissues from harm.
The circumstances of their disappearances are all fascinating, and some, sadly, have never been found. One of the more high-profile missing persons cases of 2012 isn't actually a missing persons case at all. Katherine Jackson was reported as missing in late-July of 2012, by her nephew, Trent Jackson.
The world is still a big and dangerous place, and unfortunately a missing person can be hard to find. But sometimes luck is with people ,and they escape whatever bizarre circumstance took them away from their family and friends. Here are 10 stories of people who disappeared and then reappeared a long time later.