Sentences with phrase «pigmented cells when»

However, the scientists have now been able to show that these special immune cells can indeed «remember» pigmented cells when they come into more frequent contact with a specific contact allergen.

Not exact matches

A newborn has more red blood cells than his body needs, and often, when a baby's immature liver can't process them quickly enough, a yellow pigment called bilirubin (a by - product of the red blood cells) builds up in the blood.

When these cells break down after birth, they produce a yellow pigment called bilirubin, which circulates in the blood.

Melanoma occurs when melanocytes — cells that make pigment in skin and hair — undergo a malignant transformation.

Their sight deteriorates from around age 6 when retinal pigment epithelial cells (RPEs) start to die off rapidly, possibly due to a defective gene.

The pigment is released when these cells are killed (center) but, 90 days later, is taken back up into new macrophages that have replaced the old ones (right).

When Kaufman, Zon and colleagues looked to see what was different about these early cancer cells, they found that crestin and the other activated genes are the same ones turned on during zebrafish embryonic development — specifically, in the stem cells that give rise to the pigment cells known as melanocytes, within a structure called the neural crest.

The pigment is released when the cells are killed (middle).

When skin cells are damaged by ultraviolet light they produce more pigment, which makes skin appear darker.

The pigment is needed by photoreceptor cells — the retina's light - sending rods and cones — and when RPE65 is mutated, the photoreceptor cells gradually die.

Only when monobenzone docks onto the tyrosinase enzyme, a so - called hapten is generated in the pigmented cell.

The key to these makeovers are special pigment - containing cells called chromatophores, which, when activated by light, can spread their pigments out or bunch them up to change the skin's overall color or pattern.

When analyzing proteins from pigmented skin cells of the African clawed frog, Provencio's team found messenger RNA that helps make a new opsinlike protein — although they have not isolated the protein itself.

Here we report that in addition to producing an ommochrome body pigment, the planarian flatworm Schmidtea mediterranea generates porphyrins in its subepithelial pigment cells under physiological conditions, and that this leads to pigment cell loss when animals are exposed to intense visible light.

The experiments also show that starvation increases the rate of pigment cell loss in light - exposed flatworms, which mirrors the worsening of disease symptoms some porphyria patients experience when they diet or fast.

Subsequent single - cell flow cytometric assays linked this shorter G1 phase to the more rapid loading of minichromosome maintenance (MCM) helicase complexes when compared to differentiated cells with longer G1 phases (neural progenitor cells and retinal pigmented epithelial cells).

Vitiligo is a relatively common skin condition which occurs when melanocytes — pigment cells — are destroyed and skin becomes white

The Cause These dark spots happen when the skin's pigment producing cells, melanocytes, simply churn out too much melanin.

When healthy cells are created, they don't have pigment.

The condition occurs when the cells responsible for producing pigment stop functioning or die.

When you look at the algae cells, the dry pigments that we use for our ink, you can literally touch the carbon material that previously was carbon dioxide.

Chameleons change their colors using chromatophores, a specialized type of cell that contains tiny sacs of pigments; when a chameleon shifts color, they do so by expanding or contracting these sacs to change the color of the cells.