| Pheomelanin is red to yellow and creates a reddish to yellowish undertone depending on quantity but especially in lighter skinned people. |
| Red hair is a clear indicator of a high pheomelanin content and is therefore often associated with very light or reddish skin. |
| There are two different melanins found in human hair, eumelanin and pheomelanin. |
| Red hair is caused by a recessive gene on chromosome 16 and has high levels of pigment pheomelanin. |
| Plumage color of homozygous birds varies from slaty blue to beige depending on the relative abundance of eumelanin and pheomelanin in the feathers. |
| Melanocytes produce two forms of melanin, black-brown eumelanin and red-yellow pheomelanin. |
