FIB-SEM reconstructions of ER and plasma membrane in multiple hair cells of olf and spinule. Sampled from the An3 at 42 h APF. An enlarged view of the internal side of the plasma membrane is shown on the right. (A) Control olf. (B) Control spinule. (C)gox¹ olf. (D)gox¹spinule. (E) TEM view of the gox mutant olf. ER whorl structure is enlarged. Bar: 1 µm. (A–D) 200 nm (A–D PM inner side, approx.), 2 µm (E left), and 100 nm (E enlarged).