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(a) 3D bioprinting a branched channel. After the 3D printed ‘bioink’ was UV crosslinked, a flow driven by pressure caused the supporting suspension to be removed, leaving the branched channel structure [120]. (b) 3D bioprinting a self-supporting structure. After the 3D printed ‘bioink’ was crosslinked by UV irradiation, the supporting suspension was dissolved by excess β-CD [120]. Scale bar 500 μm. Reprinted with permission from Ref. [120]. Copyright 2015, copyright Highley et al.
