Results 261 to 270 of about 4,669,551 (309)

Common Origin of Pigment Cells

Science, 1979
The fundamentally diverse vertebrate pigment cells, melanophores, xanthophores, and iridophores, contain pigmentary organelles known, respectively, as melanosomes, pterinosomes, and reflecting platelets. Their pigments are melanins, pteridines, and purines.
J T, Bagnara, J, Matsumoto, W, Ferris, S K, Frost, W A, Turner, T T, Tchen, J D, Taylor   +6 more
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Pigmented Renal Cell Carcinoma

The American Journal of Surgical Pathology, 1995
A rare case of pigmented renal cell carcinoma is presented. The tumor was yellow, somewhat elastic, and soft with focal gray and tan areas. Microscopically, the tumor was a typical renal cell carcinoma of the clear-cell type. Tumor cells containing brown pigment in the cytoplasm were scattered throughout the tumor. Ultrastructurally, the electron-dense
T, Kamishima, T, Fukuda, I, Emura, T, Tanigawa, M, Naito   +4 more
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Pigmented spindle cell naevus

British Journal of Dermatology, 1990
We report 22 cases of pigmented spindle cell naevus (PSCN). The usual appearance of these naevi is that of a heavily pigmented papule found mostly on the legs of young patients. Histologically, PSCN was characterized by symmetrical proliferation of spindle-shaped pigmented melanocytes grouped in large junctional nests.
L, Requena, E, Sanchez Yus
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The Focal differentiation of pigment cells

Journal of Experimental Zoology, 1979
AbstractA study has been made of the normal development and of the regeneration after excision of the groups of large pigment cells which form the spotted skin pattern of the gecko Eublepharis macularius, together with the effects of neonatal graft transplantation on this pattern.
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Pigmented cells in the leptomeninges of the cat

The Anatomical Record, 1984
AbstractCells laden with pigment granules are described in the leptomeningeal tissues of the cat and kitten. These cells can be identified consistently by gross observation following vascular perfusion. The fusiform or stellate pigmented cells are most often found in association with the outermost layers of the arteries of the subarachnoid space.
D E, Morse, J L, Cova
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Pigment Effector Cells in a Cnidarian

Science, 1962
Chromatophore complexes are described in the siphonophore Nanomia cara . The dispersion and concentration of pigment are related to variation in light intensity and do not appear to be endogenously influenced. The pigment, possibly an ommochrome, has an absorption maximum at 465 to 470 mμ.
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Pigmented Basal Cell Epithelioma

Archives of Dermatology, 1973
To the Editor.— The statement was made by Dr. C. De Fe ( Arch Dermatol 105:447-448, 1972) that "One of the things that has come through in our oncology section study was that those people who have blue eyes do not have pigmented basal cell epitheliomas." We wish to report that this statement is not consistent with our own experience.
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Dermoscopy in Pigmented Squamous Cell Carcinoma

Journal of Cutaneous Medicine and Surgery, 2009
Background: The diagnosis of squamous cell carcinoma (SCC) is, generally, a clinical diagnosis, but in some cases, when the lesion is pigmented, as in our case, the differential diagnosis between pigmented SCC and other pigmented skin lesions, in particular melanocytic lesions, is difficult.
V. De Giorgi, B. Alfaioli, F. Papi, A. Janowska, M. Grazzini, LOTTI, TORELLO, MASSI, DANIELA   +6 more
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Pigmented Squamous Cell Carcinoma

The American Journal of Dermatopathology, 2007
Although dendritic, melanin-containing melanocytes can be seen in a variety of epithelial neoplasms, only 0.01% to 7% of all squamous cell carcinomas (SCC) are pigmented. Furthermore, most reported cases have occurred in the oral and ocular mucosa, with relatively few cases reported to originate in the skin.
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The Spleen Pigment Cells in Some Amphibia

Pigment Cell Research, 2004
It was demonstrated that the spleen pigment cells of Amphibia are macrophages: they show an ultrastructurally distinctive morphology, are able to phagocytose and react positively for non‐specific esterases. These pigmented macrophages express mRNA for tyrosinase and also they show dopa oxidase activity; therefore they are able to synthesize melanins ...
Marina, Scalia, Cinzia, Di Pietro, Mariangela, Poma, Marco, Ragusa, Giovanni, Sichel, Concetta, Corsaro   +5 more
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