dextran sulfate-cheap substitute

[David M. Berman]

There's literature on another sulfate, I think chondroitin sulfate,
available from Fisher Scientific.  It's part of the protocols they
supply for in situ hybridization using their _____? Probe machine.  If
they don't know what you're talking about, e-mail me and I'll see what
I can find for you.  Anyway, the other sulfate is cheaper, effective,
and less viscous.
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