[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/US/08/17/bleed.air.tests/art.williams.jpg caption="Terry Williams hugs her two boys – Jake, left, and Zack – in 2006, before she says toxic cabin air made her sick."] By Allan Chernoff and Laura Dolan (CNN) – Inside a freezer in a research laboratory at the University of Washington are blood and blood plasma samples from 92 people … Continue reading Scientists analyze blood to test for toxic airplane air exposure