Expression of the voltage-gated potassium channel subunit Kv1.1 in embryonic zebrafish Mauthner cells

► We examined the presence of Kv1.1 associated with zebrafish Mauthner cells. ► In situ hybridization indicates the presence of Kv1.1 mRNA in the hindbrain. ► Immunohistochemistry using anti-Kv1.1 positively labels Mauthner cells. ► Block of Kv1.1 alters the number of APs produced by the Mauthner cell. ► Kv1.1 is associated with Mauthner cells and may play a role in their activity.