Sentences with phrase «of pigment cells»

This trait involves a massive expansion of pigment cells that not only makes the skin and comb black but also causes black internal organs.

After 20 h we observed a layer of pigmented cells within the subretinal space of the RCS rat, which were Ki67 negative.

However, when the animals are exposed to intense light for extended periods of time, which is unlikely to occur in the wild, porphyrin production leads to loss of the pigment cells.

Importantly, we show that the presence of pigmented cells within the subretinal space does not necessarily reflect survival of transplanted cells.

Orange Glow The inside of the eye derives its orange color from a layer of pigment cells inside the retina.

Microscopic image of zebrafish larvae: The distribution of the pigment cells (black) can be seen easily in the animals, which are only the size of an eyelash.

They first pooled together information about colors in related modern snake species in the same family, Colubridae (which contains 70 % of all known snakes): specifically, which combinations of pigment cells produce which colors.

Using a scanning electron microscope, McNamara and her team found nanometer - scale objects in the fossil skin that they say are the right shape, size, and location to be three kinds of pigment cells found in modern snakes: one whose pigments produce a range of browns and blacks, a second that makes yellows, oranges, and reds, and a third that can contribute a variety of different colors.

The snake specimen, which was discovered in the early 1900s years ago in northeastern Spain, was fossilized in a way that preserved the shapes and sizes of these pigment cells.

It lays the foundation for subsequent studies to investigate the biology of pigment cell differentiation and chemical identification of the pigments themselves (both of which I believe are beyond the scope of this study).

Following up on this observation, the authors show that this process is not simple photobleaching, but rather is caused by active elimination of pigment cells.

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.

In the article, the researchers show that the white coat color in dogs is caused by mutations in the MITF gene that is crucial for normal development of pigment cells.

-- We have shown that the genetic change causing fibromelanosis is a complex rearrangement that leads to increased expression of Endothelin 3, a gene which is known for promoting the growth of pigment cells, explains Ben Dorshorst the post-doctoral researcher responsible for the work.

«The lack of pigment cells causes the death of the nerve cells that need to develop for hearing to occur.»

The cause of the degeneration of the stria vascularis is not known for certain, but appears to result from the absence of pigment cells (melanocytes) in the stria.