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Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment ).
Woman with Waardenburg syndrome type 2, showing heterochromia and white forelock. The difference that defines type 2 from type 1 is that patients do not have the wider gap between the inner corners of the eyes (telecanthus/dystopia canthorum). Sensorineural hearing loss tends to be more common and more severe in this type.
The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
A rare predominantly black cat with odd eyes. The odd-eyed colouring is caused when either the epistatic (recessive) white gene or dominant white (which masks any other colour genes and turns a cat completely solid white) [3] or the white spotting gene (which is the gene responsible for bicolour coats) [4] prevents melanin granules from reaching one eye during development, resulting in a cat ...
In kids with myopia, the eye grows too much, passing beyond the point of focusing the image. In Berntsen's study, nearly 300 children, ages 7 to 11, were randomly assigned to wear regular, single ...
A human chimera is a human with a subset of cells with a distinct genotype than other cells, that is, having genetic chimerism.In contrast, an individual where each cell contains genetic material from a human and an animal is called a human–animal hybrid, while an organism that contains a mixture of human and non-human cells would be a human-animal chimera.
The company states the product could lead to choking for babies and young kids. The product was recalled on January 31, 2025. What are Gerber Soothe N Chew Teething Sticks?
The maximum semaglutide dose for weight loss is 2.4 milligrams (mg) per week. Your healthcare provider will start you on a lower weekly dose and gradually increase it over time.