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A surrogate nucleobase based on 4,4'-cyanine provided up to 195-fold enhancement of red fluorescence upon complementary RNA binding. A mixture of FIT probes allowed the localization of oskar mRNA and other polyadenylated mRNA molecules in developing oocytes from Drosphila melanogaster by wash-free FISH and STED.
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Hövelmann et al. (2015) studied this question.
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