-54- 



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53 





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54 



Figure 53. Electron micrograph of virus aggregations 

 of ORSV-infected Cattleya leaf cell 

 showing the presence of gold particles on 

 their surface. Section is incubated with 

 ORSV antiserum (1/1000 dilution) and 

 labelled with protein A-gold. Bar = 300 nm, 



Figure 54. Same area as in Fig. 53, except 



incubation is with CyMV antiserum 

 (1/1000 dilution). Bar = 300 nm. 



