Linked from
The 9 pages that link to Pheomelanin, each with the reason it gives.
MelaninBroader topic: Its chemistry and lighter coloration distinguish it from eumelanin.
MelanocyteBroader topic: Its production contributes to red and blond pigmentation by melanocytes.
EumelaninCompared with: Its color and chemistry distinguish it from brown-black eumelanin.
Tabby catRelated: It supplies the warm red or cream tones that can appear in tabby coats.