FIG. 3.

IEM analysis of ultrathin sections of aggregates formed by recombinant NP. Immunogold labeling was performed as described in the legend to Fig. 1. (a) NP aggregate labeled with gold showing striated matrices with a periodicity of approximately 25 nm. The inset shows a row of gold particles which occurred in a longitudinal section. Bar, 100 nm. (b) NP aggregates labeled with gold showing a hexagonal pattern (hexagons are indicated by squares and crosses). Bar, 100 nm. The inset shows one circular domain labeled by five gold particles, one of which is slightly dislocated.