Yeah. The clinical trials … Different clinical trials have different criteria for entry. Clinical trials that are very interested in the hereditary aspects of Alzheimer's disease may well want to do chromosomal studies, gene studies as part of the entry into the trial but it’s going to vary from trial to trial what the inclusion criteria are. In other words, this is a person who can enter the trial if he or she chooses to do so as opposed to the exclusion criteria. For instance, there may be … I don't know about this exactly but just for example, theoretical, there may be a trial that says if you've had a known head injury, you would be excluded from those trial because we’re looking at people with Alzheimer's disease who have not had a head injury. It would vary from trial to trial.
