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. Author manuscript; available in PMC: 2019 Jul 10.
Published in final edited form as: Int J Pharm. 2018 May 3;545(1-2):286–294. doi: 10.1016/j.ijpharm.2018.05.003

Fig. 2.

Fig. 2

Schematic of pollen grains (PGs) as an oral vaccine delivery system. (A) A natural raw PG shell with plant-derived biomolecules (BM) surrounded by a wall. (B) A chemically treated PG with an intact shell and a clean core. (C) A chemically treated PG shell filled with vaccine (V) solution. PGs are suspended in a vaccine solution, and as a result, the vaccine is in the PG core and also surrounds it.