Howard Boland (C-LAB) facilitated the study for one the students, Sarah Farajallah (image above), visualising dead and living bacterial cells using staining agents known as Propidium Iodide (or PI) and DAPI (or . The fluorescent and confocal microscopy images shown at the exhibition combines the use of bacteria expressing green fluorescent proteins stained with PI, and results in an overlapping image where the dead cells are red and living green.