Fig 2. Inner ear diffusion of FastGreen administered at embryonic stage E13.5.

(A) Photo of an E13.5 embryo inside the uterine horn. Notice the capillary pointing towards the external ear, located bellow the ‘V’-shaped veins corresponding to the transverse and sigmoid sinus veins. (B-C) Micrographs of E13 mouse embryos after the inner ears were injected with FastGreen. (B) The injected (left) ear. (C) The contralateral ear, which shows a higher concentration of dye. Scale bar 1 mm.