**2.6** *In vivo* **imaging**

Three month old Beta2m-mice were tail vein injected with 1 x 106 Raji cells expressing WT or x11 Fluc. These were imaged using 30-60 s exposures in an IVIS 200 imager (Caliper, NJ, USA) at days 3 and 10 after anaesthesia with isofluorane and 15 min after intra-peritoneal (i.p.) injection of 200 l of sterile D-luciferin (Regis Technologies, IL, USA).
