Human influenza hemagglutinin (HA) is a surface glycoprotein required
for the infectivity of the human virus. The HA tag is derived from the
HA molecule corresponding to amino acids 98-106 has been extensively
used as a general epitope tag in expression vectors. Many recombinant
proteins have been engineered to express the HA tag, which does not
appear to interfere with the bioactivity or the biodistribution of the
recombinant protein. This tag facilitates the detection, isolation, and
purification of the proteins.
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