Figure 8. Examples of bioluminescence imaging. (a) Migration of neural progenitor stem cells across the midline towards an implanted glioma in a mouse. The neural progenitor cells were labelled with the luciferin (luc) gene ex vivo so that cells expressing luciferin exhibit luminescence under appropriate conditions. (b) luc-labelled ovarian cancer cells implanted at different densities in the peritoneal cavity of a nude mouse. Note that cellular densities as low as 5 x 103 cells can be imaged. Reproduced with permission [55].