Funding for this research was provided by:
Howard Hughes Medical Institute (Henikoff)
National Human Genome Research Institute (1R01HG010492)
Received: 28 June 2019
Accepted: 3 July 2019
First Online: 12 July 2019
Ethics approval and consent to participate
: Not applicable.
: All authors consent to publication.
: The authors declare that they have no competing interests.