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        Analysis of In Vivo Gene Expression Using Epitope-Tagged Proteins

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        Only a handful of tagged molecules have been used successfully in vivo to monitor gene expression. The most commonly used are β-galactosidase (β-gal) and green fluorescent protein (GFP). Both molecules pose limitations with in vivo detection. When using GFP, autofluorescence may be encountered in tissues and tissue sections. Similarly, when using β-gal as a marker, the penetration of X-gal substrate is difficult in tissues with extensive extra cellular matrix and in calcified tissues.
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