1-poul_review_2

1-poul_review_2 - 1 Genetics: 1 Antioxidants: 2...

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1. Genetics: Melanocortin-1 receptor  MSH binds        Point Mutations in the MC-1R gene alters melanin based plumage color.   Cost of Melanin Production  Melanin signals do not appear  Melatnins serve many beneficial functions:  1. Antioxidants: melanin has double bonds   2. Cation chelators: Combat heavy metal toxicities  3. Tissue Strengtheners:   4. Antimicrobials & parasite deterrants  5. Photoprotectants  6. Thermoregulators   7. Melanin resist years and years of decay  2.) CAROTENOIDS: Ranges from yellow to red .. pink    Second most prevalent  pigments in the Avian integument.  Confer color to members of most invertebrate phyla and all vertebrate classes 
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