Figure 3
From: Avipoxviruses: infection biology and their use as vaccine vectors
A, B and C Virion morphology of avipoxviruses in chicken embryo fibroblast cells (CEF). (A) Electron microscopy showing crescent-shaped structures consisting of a membrane with spicules on the convex surface, (B) spherical non-infectious immature viruses (IV) which give rise to formation of (C) intracellular mature virions (IMV) by a series of maturation steps.