Cytochrome b5 reductase 4 (CYB5R4)

NADH-cytochrome b5 reductase involved in endoplasmic reticulum stress response pathway. Plays a crucial role in protecting pancreatic beta-cells against oxidant stress, possibly by protecting the cell from excess buildup of reactive oxygen species (ROS).

Reduces a variety of substrates in vitro, such as cytochrome c, feericyanide and methemoglobin. .