GFP fusion proteins
A human mesenchymal stem cell. In this cell a microtubule protein is fused to GFP (green) while a histone protein is fused to RFP (red). As you can see the localization of the fused protein can now be determined using fluorescent reporter fusions.
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"HMSC MAP4GFP H2BRFP."
http://commons.wikimedia.org/wiki/File:HMSC_MAP4GFP_H2BRFP.jpg
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