"Of course, there are some differences between mushrooms and humans — and one is in the molecular structure of the enzyme tyrosinase,” says Kolbe, the chief scientist for photobiology at ...

Both eumelanin and pheomelanin are made from the amino acid tyrosine, using the enzyme tyrosinase. Increased tyrosinase activity increases pigment production and results in a darker hair color.

Oncept contains a gene encoding human tyrosinase, an enzyme associated with skin pigmentation, which stimulates an immune response against canine tyrosinase in melanoma cells. “Canine melanoma ...