In mammals, however, it occurs because the enzyme tyrosinase is lacking.
In frogs and salamanders, it is apparently caused by hormonal deficiency, because it can be cured by an injection of pituitary hormone. In mammals, however, it occurs because the enzyme tyrosinase is lacking. Most people with it exhibit nystagmus, or oscillation of the eyeballs. For ten points, identify the condition due to the absence of melanin, the pigment of coloration, resulting in pale skin, white hair, and eyes that appear pink.
In frogs and salamanders, it is apparently caused by hormonal deficiency, because it can be cured by an injection of pituitary hormone.
Albinism