* Preprint of an article submitted for consideration in the Pacific
Symposium on Biocomputing \c{opyright} 2015; World Scientific Publishing Co.,
Singapore, 2015; http://psb.stanford.edu/ Access Paper or Ask Questions
* Appears in Proceedings of the Twenty-Fifth Conference on Uncertainty
in Artificial Intelligence (UAI2009). arXiv admin note: substantial text
overlap with arXiv:0912.4473 Access Paper or Ask Questions