> Compare the 1976 flu:
> http://www.ncbi.nlm.nih.gov/protein/256385557
> 
> with 2009 H1N1:
> http://www.ncbi.nlm.nih.gov/protein/268376601
> 
> Can you spot the mutations? The PB1 and PB2 proteins for both are
> noticeably similar, since if I recall those are what define it as H1N1.
> I haven't gotten through the rest or the proteins to look for other
> similarities.

Of course, after I typed this, I looked up which proteins define an H1N1
virus and it is the HA and NA proteins. Not the PB1 and PB2 as I
thought. Still lots of similarities. Now I have the urge to compare the
protein structure to the 1918 Spanish Flu, and see how closely related
they are.

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