Whole embryo IHC

From:"Chu, Shirley" <schu@deltagen.com>

Hello Histonetters,
Currently I'm involved with a project doing immunohistochemical
staining of whole (not sections) mouse embryos staged at e9.5-e10.5.
Although I'm obtaining a good intense staining pattern localized to
the site of interest with minimal background, I'm unable to retain it
for long term purposes.  The protocol is a two step indirect,
monoclonal primary followed by a peroxidase conjugated IgG F(ab)2
secondary and using either DAB or DAB/NiCl as my substrate.  After
development of the substrate to desired intensity, I placed it in
0.1M Tris pH7.4 with 0.5% Triton X-100 to stop the reaction.  Photos
are taken at this point and then it is transferred to one of the
following solutions: PBS, 10%NBF or 4% paraformaldehye at 4C.  After
1-2 days there is significant loss of staining intensity although
what remains is localized to site of interest, while after a week of
storage the signal is so weak that I cannot really use it at this
So my question is: What can I store these stained embryos in to
stabilize the staining and store them for long term purposes
(possibly for months).
I'm using someone elses computer to send this off this message but
any responses can either be posted directly on the histonet or sent
directly to me at: schu@deltagen.com.
Thanks in advance for any responses.

Shirley Chu
Deltagen Inc.
Menlo Park CA

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