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. Author manuscript; available in PMC: 2012 May 30.
Published in final edited form as: Vaccine. 2009 Nov 4;28(3):664–672. doi: 10.1016/j.vaccine.2009.10.103

Fig. 2.

Fig. 2

Schematic diagram of the CD4+ 20 epitope DNA insert. The epitope order and amino acid spacer usage are shown. Influenza-derived epitopes were used in addition to the universal helper epitope, PADRE [23].