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A piebald mare. In British English piebald (black and white) and skewbald (white and any colour other than black) are together known as coloured.In North American English, the term for this colouring pattern is pinto, with the specialized term "paint" referring specifically to a breed of horse with American Quarter Horse or Thoroughbred bloodlines in addition to being spotted, whereas pinto ...
The inner layer is unpigmented until it reaches the iris, where it takes on pigment. The retina ends at the ora serrata . The space between the ciliary body and the base of the iris is the ciliary sulcus .
Erik Agard (born 1993) is a crossword solver, constructor, and editor. He is the winner of the 2016 Lollapuzzoola Express Division, the 2018 American Crossword Puzzle Tournament (ACPT), a frequent contributor to the New York Times crossword puzzle, a crossword constructor for The New Yorker, the former USA Today crossword editor, and a former Jeopardy! contestant.
Choroid dissected from a calf's eye, showing black RPE and iridescent blue tapetum lucidum. The RPE was known in the 18th and 19th centuries as the pigmentum nigrum, referring to the observation that the RPE is dark (black in many animals, brown in humans); and as the tapetum nigrum, referring to the observation that in animals with a tapetum lucidum, in the region of the tapetum lucidum the ...
Often called "albino", this amelanistic Burmese python owes its yellow color to unaffected carotenoid pigments.Amelanism (also known as amelanosis) is a pigmentation abnormality characterized by the lack of pigments called melanins, commonly associated with a genetic loss of tyrosinase function.
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The darker feathers of birds owe their color to melanin and are less readily degraded by bacteria than unpigmented ones or those containing carotenoid pigments. [36] Feathers that contain melanin are also 39% more resistant to abrasion than those that do not because melanin granules help fill the space between the keratin strands that form ...
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