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. Author manuscript; available in PMC: 2011 Feb 23.
Published in final edited form as: J Biomater Sci Polym Ed. 2009;20(1):1–20. doi: 10.1163/156856208X393464

Figure 1.

Figure 1

Physiological challenges encountered in both the development of modified or controlled release oral dosage forms for low molecular weight compounds and the effective delivery of macromolecules.