Chen ZQ, Liu Y, Zhao JH, Wang L, Feng NP. Improved oral bioavailability of poorly water-soluble indirubin by a supersaturatable self-microemulsifying drug delivery system. International Journal of Nanomedicine. 2012; 7:1115–1125.
should be as shown below:
Figure 1 Chemical structure of indirubin.
![Figure 1 Chemical structure of indirubin.](/cms/asset/89e26def-2fbe-4c64-a1ac-ba2a082154a2/dijn_a_31480_f0001_b.jpg)
The correct caption to Figure 4 should be:
Figure 4 Molecular structures of (A) PEG 4000, (B) PVP, (C) HPMC and schematic diagrams of hydrogen bonds between indirubin and (D) PEG 4000 and (E) PVP.
should be as shown below:
Figure 4B Molecular structure of PVP.
![Figure 4B Molecular structure of PVP.](/cms/asset/4c000048-24ba-4174-aa18-32076dc5f33b/dijn_a_31480_f0002_b.jpg)
should be as shown below:
Figure 4C Molecular structure of HPMC
![Figure 4C Molecular structure of HPMC](/cms/asset/b69bf36c-2921-4492-9a8d-e93e7fe80d3c/dijn_a_31480_f0003_b.jpg)
should be as shown below:
Figure 4D Schematic diagram of hydrogen bonds between indirubin and PEG 4000.
![Figure 4D Schematic diagram of hydrogen bonds between indirubin and PEG 4000.](/cms/asset/1851a9a2-3401-4d46-877f-4afe15628c01/dijn_a_31480_f0004_b.jpg)