 | Micrograph prepared by
Dr Stephan Biel,
Robert Koch Institut, Berlin, Germany
and provided by Dr H-W Ackermann
 | Department of Microbiology Medical Faculty Laval University Quebec, Canada. |
Specimen stained with 2 % uranyl acetate.
The bar represents 100 nm.
Influenza A virus preparation from vaccine production. Virus was purified using saccharose gradient centrifugation.
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