It did refer to that, Judy, and said they are no longer sure that is what was happening. Clearly something was happening--it has too high an incidence in the population, but a narrow population. But is it a byproduct of something happening on a neighboring gene? It may cause a bad reaction to a huge attack on the immune system (how this doctor died) or it might build iron reserves for a settled community not eating enough meat, and so forth. But it is giving them insights to our early evolution.