Neural crest cells of ectothermic vertebrates give rise to three types of pigment cells: melanophores, xanthophores, and iridophores. In early larval salamanders, these cells can combine to generate a variety of pigment patterns across taxa, including vertical bars and horizontal stripes. Such patterns offer an opportunity to study neural crest morphogenesis and differentiation, as well as the ...

Zebrafish (Danio rerio) feature black and yellow stripes, while related Danios display very different patterns. All these patterns form due to the interactions of pigment cells, which self-organize on the fish skin. Until recently, research focused on two cell types, but newer work has uncovered the leading role of a third type, called iridophores. By carefully-orchestrated transitions in shape...

20% MgSO. (1 mlll00 gm weight) was injected and the frogs were observed. IS-20 minuteslater it was seen that there was a marked depression of the CNS which was manifested in a loss of the righting reflex. At this time there was an obvious change in the colour of the 'Paper presented at the xm Annual Conference of the Association of Physiologists and Pharmacologists of Indiaheld at Pondicherry i...

Several types of cells show left–right asymmetric behavior, unidirectional rotation, or spiral movements. For example, neutrophil-like differentiated HL60 (dHL60) leftward bias in response to chemoattractant. Neurons extend neurites, creating a clockwise spiral. Platelet shows arrangements actin fibers. In the microfabricated culture environment, groups C2C12 (mouse myoblast cell line) were aut...

Hemibryconsanjuanensis, new species, is described from the upper San Juan River drainage, Pacific versant, Colombia. It is distinguished from Hemibryconboquiae, Hemibryconbrevispini, Hemibryconcairoense, Hemibryconcolombianus, Hemibryconmikrostiktos, Hemibryconmetae, Hemibryconpalomae, Hemibryconrafaelense and Hemibrycontridens by the presence of a circular or oblong humeral spot that is locate...