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Melanin (/ ˈ m ɛ l ə n ɪ n / ⓘ; from Ancient Greek μέλας (mélas) 'black, dark') is a family of biomolecules organized as oligomers or polymers, which among other functions provide the pigments of many organisms. [1] Melanin pigments are produced in a specialized group of cells known as melanocytes.
Melanin is yellowish to dark hazel in the stromal pigment cells, and black in the iris pigment epithelium, which lies in a thin but very opaque layer across the back of the iris. Most human irises also show a condensation of the brownish stromal melanin in the thin anterior border layer, which by its position has an overt influence on the ...
The iris pigment epithelium is brownish black due to the presence of melanin. [54] Unlike brown eyes, blue eyes have low concentrations of melanin in the stroma of the iris, which lies in front of the dark epithelium.
Albinism is the congenital absence of melanin in an animal or plant resulting in white hair, ... (black/brown): contain black and ... including the iris, retina, eye ...
Iris chrysographes is a clump-forming herbaceous perennial with creeping rhizomes.The leaves are linear and greyish green, and up to 70 cm (28 in) long. The hollow flowering stems, 25–30 cm (9.8–11.8 in) long, bear slightly scented flowers in early summer.
The stroma around the iris sphincter muscle becomes darker than the peripheral stroma. [medical citation needed] A stimulation of melanin synthesis within iris melanocytes has been postulated. [21] Neoplasm – Nevi and melanomatous tumors. Iridocorneal endothelium syndrome [3] Iris ectropion syndrome [3] [22]
Iris is a flowering plant genus of 310 accepted species [1] with showy flowers.As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera.
Iris paradoxa is a species of flowering plant native to western Asia. It has large upright petals and smaller lower petals, which is unique amongst most iris forms. They come in various shades from white, lavender, mauve, medium purple, violet, dark purple to black. It has a black or purplish black beard on the lower petals.
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