Abstract
Summary
Tumorous spleen from chickens with erythroblastosis RPL-12 strain were examined in ultrathin sections. The cytoplasm of cells of the affected spleens showed changes similar to those observed in visceral lymphomatosis. Characteristic particles were observed in cytoplasm of cells similar in structure and size to that of particles in visceral lymphomatosis. The diameter of the particles was found to vary from 650 Å to 830 Å, with an average of 730 Å, and that of the internal dense core varied from 280 Å to 380 Å, with an average of 320 Å. The average size of the characteristic particles in erythroblastosis RPL-12 strain and visceral lymphomatosis is similar and appears to be larger than that of similar particles in erythroblastosis “R” strain and granuloblastosis (myeloblastosis).
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