In human fetal life, this area produces melanocyte stimulating hormone or MSH which causes the release of melanin pigment in skin melanocytes ( pigment cells ).
42.
Neural crest cells will migrate through the embryo and will give rise to several cell populations, including pigment cells and the cells of the peripheral nervous system.
43.
These photophores have a " lens " of chromatophores, pigment cells which may allow the squid to modify the colour of the light produced by the photophores.
44.
To prevent light entering at an angle from being detected by the ommatidium it entered, or by any of the neighboring ommatidia, six pigment cells are present.
45.
These observations suggest a role for mammalian MC1R outside the pigment cell, though the exact mechanism through which the protein can modulate pain sensation is not known.
46.
Research has shown that this change in coloration is due to the differential action of the pineal hormone melatonin on pigment cells in different regions of the integument.
47.
Pigmentary glaucoma ( also, pigmentary dispersion syndrome ) is caused by pigment cells sloughing off from the back of the iris and floating around in the aqueous humor.
48.
The suppression of pigment cells ( melanocytes ) in the iris and in the stria vascularis of the cochlea ( inner ear ) leads to blue eyes and deafness.
49.
More common than a complete absence of pigment cells is localized or incomplete hypopigmentation, resulting in irregular patches of white on an animal that otherwise has normal colouring and patterning.
50.
The skin of face and hands has about twice the amount of pigment cells as unexposed areas of the body, as chronic exposure to the sun continues to stimulate melanocytes.
