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. Author manuscript; available in PMC: 2015 Oct 21.
Published in final edited form as: Magn Reson Med. 2015 Apr 27;74(2):544–549. doi: 10.1002/mrm.25748

FIG. 1.

FIG. 1

a–e: Schematic diagram of the plasmids used. Promoter-less pGL3-basic (a), pPEG-fLuc (b), pCMV-Tri (showing only the fLuc expression cassette) (c), pCMV-LRP (d), and pPEG-LRP (e). f: PEG-3 promoter is active in the rat 9L glioma cell line. Relative activities of PEG-3 promoter and CMV promoter in 9L cells were measured by the dual luciferase assay after transient transfection. Firefly luciferase activity was normalized to that of renilla luciferase and to total protein. Error bars represent standard deviation, n = 3. fLuc: firefly luciferase, V5: V5 tag.