Try the NIH Gopher.  I seem to remember that IRG listings were a directory
I came across while cruising through one day, but as I recall, it was in
development, so only a few (if any?!?) IRGs were actually listed.  Sorry I
couldn't be nicer!

Len

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Leonard P. Paplauskas    Assistant Vice President for Research     |
203-679-3173             University of Connecticut Health Center   |
FAX 679-2670             Farmington, CT   06030-5355               |
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xxxxxx@neuron.uchc.edu                                           |
xxxxxx@sun1.uchc.edu                                           |
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