Red-haired, fair skinned people have a higher instance of skin cancer than black-haired individuals. And the melanin pigment in the skin of red haired people differs chemically from the melanin in the skin of those with black hair. So researchers have tried to compare the red with the black pigments, but have not succeeded in comparing the isolated human pigments until now.
Quotes about melanin (2 Quotes)
There are some mature birds that have short beards from a lack of melanin that makes the beard weak and it will break. The best method is to wait and see the bird in full strut. If his fan (tail feathers) form an even-edged circle, then he's mature. If there are shorter feathers on the edges of the fan with taller feathers in the middle, then it's a jake.