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TEM images of the three types of CAs. From left to right: (a) cross-sections of MB-plain, (b) MBN-on (SPION weight percentage: 29%) and (c) MBN-into (SPION weight percentage: 15%) are displayed. The black dots represent SPIONs. Note that the cross-sections were obtained at random distances from the equatorial plane of the MBs, resulting in size differences between the analysed MBs. The scale bars represent 500 nm. Courtesy of IOS Press [27].
