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difficulty in Biological Definition

Antigenic shift

... influenza combine to form a new subtype having a mixture of the surface antigens of the two original strains. Because the human immune system has difficulty recognizing the new influenza strain, it may be highly dangerous. Antigenic shift is contrasted with antigenic drift which is the natural ...

Ebola

... obviously for security reasons. However, scientists do say that altering the Ebola virus for biological warfare is possible although unlikely. The difficulty in changing Ebola to a potential weapon is twofold: first, the Ebola virus would have to be airborne to be effective. Although some have noted that ...

Eukaryote

... have also been proposed for the nucleus and eukaryotic flagella , but this is not generally accepted, both from a lack of cytological evidence and difficulty in reconciling this with cellular reproduction. Cytoskeletal structures Many eukaryotes have slender motile projections, usually called ...

Gene therapy

... small viruses with a genome of single stranded DNA. There are a few disadvantages to using AAV, mainly the small amount of DNA it can carry and the difficulty in producing it. This type of virus is being used, however, because it is non-pathogenic (most people carry this harmless virus). In contrast to ...

Ion channel

... by Roderick MacKinnon using X-ray crystallography won a share of the 2003 Nobel Prize in Chemistry . Because of their small size and the difficulty of crystallizing integral membrane proteins for X-ray analysis, it is only very recently that scientists have been able to directly examine what ...
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