Figure 5.

Photopolymerization ex vivo in zebrafish larvae and chicken brain. Microinjection (10 nL) using glass capillary of 3E‐COONa (20 mg mL⁻¹ in MilliQ water) with Rose Bengal into the brain ventricle of zebrafish larvae Casper mutants (Tg(elav3:GCaMP6f )) and sagittal imaging before (A) and after (B) photopolymerization using green light (550 nm). Transversal imaging before (C, Brightfield, D), far‐UV 385 nm) and after (E, Brightfield, F), far‐UV 385 nm) photopolymerization. G) Illustration of intermembrane application (created with BioRender.com). H–J) Formation of spatially controlled bioelectronics on the chicken brain using an oxygenated mixture of 3E‐S:A5, Rose Bengal, Urea, PEG‐400, and Triton x‐100 illuminated with green light (20x objective).