Abstract
Summary
Ultrathin sections of tumorous spleen from chickens with visceral lymphomatosis acquired after natural and experimental exposure have been examined in the electron microscope. Spherical and spheroid particles were observed within inclusion-like bodies present in cytoplasm of cells, in cytoplasmic vacuoles, and in intercellular spaces. The particles have an internal dense zone of about 300 Å, surrounded by a less dense zone and limited by an outer membrane of a size varying from 640 Å to 820 Å, and average diameter of 720 Å. These particles resemble in appearance but not in size particles observed in erythroblastosis and granuloblastosis of chickens.
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