[1] Univ Alabama, Dept Med, Div Genet & Translat Med, Birmingham, AL 35294 USA
[2] Jackson Lab, Bar Harbor, ME 04609 USA
[3] Univ Alabama, Dept Biostat, Birmingham, AL 35294 USA
[4] Univ Alabama, Dept Microbiol, Birmingham, AL 35294 USA
[5] Univ Alabama, Dept Genet, Birmingham, AL 35294 USA
[6] Univ Alabama, Dept Pediat, Birmingham, AL USA