Fig. 3. Ultrathin sections of virus-infected cells. (A) The
immature empty capsids were probably formed by sealing
tubular membranes (indicated by arrows). Scale bar, 200 nm.
(B) The possible entry of nucleo electron-dense materials into
incomplete empty viral capsids. The striped electron-dense
materials could be inserted into one or two empty capsids at
the same time (indicated by arrows). Scale bar, 200 nm.