Fishes have diverse pigment patterns, yet mechanisms of pattern evolution remain poorly understood. In zebrafish, Danio rerio, pigment-cell autonomous interactions generate dark stripes of melanophores that alternate with light interstripes of xanthophores and iridophores. Here, we identify mechanisms underlying the evolution of a uniform pattern in D. albolineatus in which all three pigment ce...

It was found in the preceding experiment that a black pigment isolated from black-appearing gallstones resembled melanins but was definitely different from the latter in the chemical structure. As a continuation of the study, this report depicts the results of comparison of the pigment with black substances prepared in vitro from various bilirubin materials. When synthetic calcium bili rubinate...

Cooney, J. J. (University of Dayton, Dayton, Ohio), H. W. Marks, Jr., and Anne M. Smith. Isolation and identification of canthaxanthin from Micrococcus roseus. J. Bacteriol. 92:342-345. 1966.-The principal colored carotenoid of Micrococcus roseus was purified by solvent partitioning followed by column and thin-layer chromatography. Absorption spectra, partition coefficients, and infrared spectr...

The results are presented of fluorescein angiography of the iris in 11 patients with anterior segment pigment dispersal syndrome. These show a general hypovascularity of the iris with fine neovascularisation at the pupil margin and the peripupillary area. Hypoplasia of the iris stroma was also present in many cases. When the condition was virtually unilateral, the vascular changes were present ...

0 N E member of the genus Bacteroides-Bacteroides melaninogenicus-characteristically produces a jet-black pigment when grown on blood agar. This property was described by Oliver and Wherry (1921) in the original account of the organism, and has since been regarded as highly distinctive. The work described in this paper is based on the chance observation that other members of the genus are also ...

Ocular pigmentation in white cats with blue and yellow eyes and in Siamese cats was examined ophthalmoscopically and histologically. Yellow-eyed white cats had entirely normal ocular pigmentation. Blue eyes of white cats had normal pigmentation of the iridial and retinal pigment epithelia but no stromal pigmentation of the iris or choroid. This deficit is apparently due to the absence of stroma...