Abstract
Istituto di Microscopia Elettronica Clinica, Università di Bologna, Via Zamboni 16, I-40126 Bologna, Italy and Istituto di Microbiologia, Università di Bologna, via San Giacomo 12, I-40126 Bologna, Italy
Cells infected by FV-3 and incubated at the non-permissive temperature of 33 °C were examined by electron microscopy. In the cytoplasmic virus matrices, only irregularly shaped vesicle-like, polyhedral and tubular capsids were present. Normal particles were produced quickly by infected cells when shifted to the permissive temperature.