Colorful: The protein arginine deiminases are members of the enzyme family that catalyze posttranslational histone modification and consequent changes in gene expression. A visual readout of catalytic activity was developed that yields large fluorescence changes across the visible spectrum. The use of different fluorophores (see picture) enables the simultaneous multicolor monitoring of a mixture of histone-modifying enzymes.
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Wang et al. (2013) studied this question.