PCR anomaly

Mark Edward Bowen mb at laplace.csb.yale.edu
Tue Oct 12 08:53:49 EST 1999

My PCR reactions have suddenly become dominated by two well defined and
reproduceable small MW (~500bp) products.  It happens with different
buffers, enzymes, primers and templates.  The products always appear to
be the same size.  I can anneal at temperatures up to 72 C and only lose
my desired product.  I've tried hot start, touch down, Mg and
temperature titrations as well as varying template and primer
concentration.  I'm at a loss.  Any ideas?  I use a Stratagene
Mark Bowen

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