Do you think that this news on Thursday contributed to the sell-off? The timing could just be coincidental.

F.D.A. Acts on Lab Tests Developed In-House

"The decision, long in coming, has been fiercely opposed by some laboratories and pathologists, who have said that regulation by the agency is unnecessary and would significantly increase the cost and time needed to develop tests , stifling innovation and depriving patients of some vital tools.'

http://www.nytimes.com/2014/08/01/business/fd....html?_r=0