Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.|Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.|Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.|Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.|Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.