Fig. 4. Comparison of expression of XHR1 with that of XFGF-8 and En-2 at tailbud stages. (AâC) Lateral view of stages 36â37 embryos hybridized for XHR1, XFGF-8, and En-2. (Aâ²âCâ²) Horizontal sections of the embryos in (AâC). Anterior is to the left. Arrowheads, MHB; mb, midbrain; hb, hindbrain; ey, eye; ot, otic vesicle; st., developmental stage.