Cover: Tracking poly(A) RNA in the nucleus in vivo. The small white circle is the site at which caged fluorescent oligo(dT), hybridized to nuclear poly(A) in a living rat myoblast cell, was uncaged. The computationally colored red signal indicates the location of fluorescent RNA after 50 ms, and the green signal indicates the distribution of the RNA in the nucleus 10 s after uncaging. (Magnification 7500×.) See Survey and Summary by Pederson in this issue: Nucleic Acids Res. (2001) 29, 1013-1016.
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