Research for a universal flu vaccine tends to focus on
A. H spikes as they mutate rapidly, allowing for more chances for the vaccine to work.
B. core proteins, as they do not mutate as rapidly as H and N spikes and they tend to be similar between different influenza strains.
C. viral tails because they exist in all flu viruses and do not mutate often.
D. N spikes because they tend to be similar between different influenza strains.
Answer: B
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