text: FUNDING
  National Institutes of Health grants, National Institute of Environmental Health Sciences and the National Library of Medicine (R01 ES014065 and R01 ES014065-04S1 to CTD); INBRE program of the National Center for Research Resources (P20 RR016463). Funding for open access charge: NIEHS grant (R01 ES014065).
  Conflict of interest statement. None declared.
  