Chromatin accessibility of the nprl3-linked hb locus mapped by ATAC-seq. (A) Schematic drawing of the nprl3-linked hb locus. Intron 7 of the nprl3 gene is marked by a red arrow. Other details are the same as in Figure 1A. (B) ATAC-seq analysis of larval (orange) and adult (red) lamprey blood. Light blue shading indicates areas enlarged in panel C.