Figure 1: (A) Among 41 clones established from luciferase-transfected PANC-1 cells, PANC-luc5 cells showed the highest emission level (arrow). (B) A bioluminescence image shows that wells seeded with serially diluted PANC-luc5 cells varied in color from red to violet-blue in accordance with decreasing cell numbers (left). There was a strong correlation between Total Flux (photons/second) and the number of PANC-luc5 cells (right). (C) Obvious luminescence signals from subcutaneous tumors developed from PANC-luc5 cells injected into both sides of the lateral region in nude mice.