Is a form of melanin that produces the red shades in cats.
The red pigment contained in the hair shaft. 
A type of melanin found in red hair; it contains sulfur and is alkali-soluble; elevated levels are found in the rufous type of oculocutaneous albinism. ... Compare: eumelanin. ... Origin: G. Phaios, dusky, + melos (melan-), black ... (05 Mar 2000) ... 
Type: Term Pronunciation: fē′ō-mel′ă-nin Definitions: 1. A type of melanin found in red hair; it contains sulfur and is alkali soluble; elevated levels are found in the rufous type of oculocutaneous albinism.
pheomelanin A type of melanin (pigment found in feathers, cuttle ink, human skin, hair, and eyes) found in red hair; it contains sulfur and is alkali-soluble; elevated levels are found in the rufous type of oculocutaneous albinism.