Extended Data Fig. 2: Amine coupling of the e-bioadhesive interface.

a, Schematic illustration of covalent coupling of fluorescein with the e-bioadhesive interface by reaction between NHS ester groups in the e-bioadhesive interface and the primary amine groups in 6-amino fluorescein. b, c, Fluorescence microscopic images of the e-bioadhesive interface with (b) and without (c) NHS ester. 3 independent experiments were conducted with similar results.