Biodefense Division, Comparative Analysis Group, Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.|Biodefense Division, Comparative Analysis Group, Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.|Biodefense Division, Comparative Analysis Group, Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.|Biodefense Division, Comparative Analysis Group, Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.