(A)–(F) Multiple Biomarkers are Heritable. (A) and (C) Representative dorsal slices from the FA images of the B6 and (B) and (D) the reference regions of interest. (E) and (F) Heritability (h2) is shown for volume, fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (RD) for these same two reference slices. (G) Heritability of the volume of 20 brain regions, across both hemispheres, dropping a strain (C57BL/6J = B6, DBA/2J = DB, BTBR = BT, CAST = CA, None dropped = No). ROIs are the hemisphere (left or right), our ROI number, and the region name.