Ultrastructural Comparison of Placental Virus With Several Type-C Oncogenic Viruses 2

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Abstract
An ultrastructural comparison was made between the typical type-C particles of mouse (Rauscher), cat (RD-114), gibbon ape, and baboon (M-7) tissue culture isolates and the particles associated with the syncytial trophoblast of baboon and human placenta. In all tissue culture isolates, all budding particles had the typical morphology of type-C particles with an electron-lucent space between the nucleocapsid and the envelope. In most budding particles in baboon placenta and all budding particles in human placenta, the nucleocapsid was closely applied directly to the envelope. Occasional but rare typical type-C particles were found in baboon placenta. The possibility that these 2 kinds of type-C particles in placentas represented 2 different viruses was discussed.

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