The image is showing an engineered three-dimensional (3D) neural tissue mimics adhered on a micro-electrode array (MEA) to conduct electrophysiological recordings of neurological electrical function. The above figure shows the brightfield image (a) with its fluorescent counterpart (b) of stitched tiles across 3.25 mm by 3.25 mm taken with the Zeiss LSM 710 Confocal Microscope at the Carl R. Woese Institute for Genomic Biology Core Facility.