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In order to perform correlative light and electron microscopy (CLEM) more precisely, we have modified existing specimen preparation protocols allowing fluorescence retention within embedded and sectioned tissue, facilitating direct observation across length scales. We detail a protocol which provides a precise correlation accuracy using accessible techniques in biological specimen preparation. By...
OSI-7836 (4′-thio-araC, T-araC) is a nucleoside analogue that shows efficacy against solid tumor xenograft models. We examined how the triphosphates of OSI-7836 (T-araCTP), cytarabine (araCTP), and gemcitabine (dFdCTP) affected the initiation of new DNA strands by the pol α primase complex. Whereas dFdCTP very weakly inhibited primase, both T-araCTP and araCTP potently inhibited this enzyme. Primase...
To investigate the mechanism of regulation of Aß production by familial Alzheimer's disease (FAD)-linked presenilin 1 (PS1), we used a cell-free system that allows de novo Aß generation to examine whether PS1 participates directly in the γ-secretase reaction. Optimal Aß generation in vitro was achieved at mildly acidic pH and could be inhibited by the aspartyl protease inhibitor pepstatin A, consistent...
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