Correction to: A Bioactive Carbon Nanotube-Based Ink for Printing 2D and 3D Flexible Electronics (Advanced Materials, (2016), 28, 17, (3280-3289), 10.1002/adma.201506420)

Concerns were raised by a third party regarding overlapping ink patterns in the lower left section of Figure 3a. The authors stated that Figure 3a was obtained by culturing cardiac fibroblasts on a pattern printed with conductive ink and staining with F-actin/DAPI to show the biocompatibility of the proposed electrically conductive bioinks. Due to the large size of the printed structure, multiple images were taken at 10X magnification and collaged to create one figure. The authors acknowledged that an image on the lower left side was used repeatedly by mistake during the collaging of the figure. Due to the elapsed time since publication, the authors were only able to obtain partial raw data, therefore, they repeated the experiment to verify and support the results of Figure 3a. The new data confirmed the same results as observed before, therefore the corresponding conclusions of the article remain unaffected. The authors apologize for the oversight and any confusion it may have caused. The corrected Figure 3 is provided below: Figure 3. Cellular behavior of the engineered ink and electrical characteristics. a,b) Fluorescence images of cardiac fibroblasts cultured on ink patterns printed on PEG-coated PET film. F-actin and cell nuclei were immunostained and fluorescently labeled green and blue, respectively. c) The metabolic activity of the cells cultured on the printed ink after 1 and 3 d of culture was confirmed using the MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium) assay. d) Cyclic voltammetry of cardiomyocytes cultured on ink electrodes fabricated on PEG-coated PET films. e) Live/dead assay after 200 charge and discharge cycles indicating high viability of cardiomyocytes. f) Immunostaining of sarcomeric α-actinin (green), cell nuclei (blue), and Cx-43 (red) revealed that the cardiac tissues (8 d culture) created on ink patterns printed on a PEG-coated PET film were phenotypically normal. Additionally, Figure S17 (Supporting Information) was revised because the magnified image shown in panel (d) did not correspond to the red box highlighted in panel (c). The updated figure now presents a representative image at higher magnification (d), consistent with the intended depiction. The corrected Figure S17 (Supporting Information) and its figure caption are provided below: Figure S17. Immunostaining for a) sarcomeric actinin (green), connexin 43 (red), and cell nuclei (blue) on day 10. b) Immunostaining for troponin I (green) and cell nuclei (blue) revealed a highly mature contractile apparatus on day 10. c) Staining for F-actin filaments (green) and cell nuclei (blue) revealed cell spreading on day 10. d) High-magnification representative image for F-actin filaments (green) and cell nuclei (blue) on day 10.