On the 25th we went to a genetics expert ad the University of Michigan. He examined John, and we talked for over an hour. He decided that John had no identifyable genetic anomoly or metabolic disorder. There would be no follow-up lab tests, because there are no tests that identify mutations consistent with John's symptoms and history. Well this is what I expected, but once in a while I like to hear it affirmed. The doctor also agreed with my malabsorption/overgrowth diagnosis. In his mind, the butyric acid made it an open and shut case. He recommended a pediatric GI specialist, as we have now strayed outside his area of expertise. So I was right, but we're not much farther along than we were before. We stop at Cookers to have a late lunch, then head home before the traffic snarl begins.