Fig. 1. Cryo-electron micrographs of particles found in a preparation of FFV grown in CrFK cells. The preparation contains two morphologically distinct viruses: FFV and FLV. (A) Individual virions. An FFV particle is marked in black. The particle displays an angular core structure (hexagon) surrounded by a double protein layer (small arrowheads), clear membrane leaflets (arrows) and prominent rod-shaped spikes (large arrowhead) that are characteristic features of foamy virus in cryo-electron microscopy. An FLV particle is marked in white. It has a round core (circle) with three protein layers (arrowheads) exhibiting a radial arrangement (small arrows). The membrane appears broad due to the presence of a submembrane protein layer (large arrow). (B) A hybrid virion, for description see text. Bar, 50 nm.

Back to main page

0001-8779 © 2003 SGM