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tactoid

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tactoid [′tak‚tȯid]
(biochemistry)
A particle that appears as a spindle-shaped body under the polarizing microscope and occurs in mosaic virus, fibrin, and myosin.


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Whorling of tumor cells reminiscent of tactoid differentiation and hyalinized nodules was noted in 5 cases.
The morphologic features, which if present in combination help confirm the diagnosis of MPNST, include (a) alternating hypocellular-hypercellular regions; (b) appearance of a thin wavy or comma-shaped nucleus, particularly in hypocellular areas; (c) presence of nuclear palisading; (d) presence of nervelike whorls or tactoid bodies resembling Wagner-Meissner corpuscles; (e) prominent thick-walled vasculature; and (f) the presence of heterologous elements.
 
 
 
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