First detected at the 8-somite stage in the trigeminal nuclei. At the 10-somite stage, also expressed in the forming hindbrain and in the neural tube. By the 20-somite stage, expression has extended to the dorsorostral, ventrorostral and ventrocaudal neuron clusters, the epiphysis and the hindbrain. At 24 hours post-fertilization (hpf), detected in the developing gut. At later stages, expression is lost from the neural tube but continues in the brain and also appears in the retina and pharyngeal cavity. Belongs to the zinc-containing alcohol dehydrogenase family. Quinone oxidoreductase subfamily.