Many of the most interesting and useful strains encountered in research readily die in storage and/or are semi-sterile. If such strains are Oak Ridge-compatible, they can be carried and even crossed as heterokaryons with the sterile but vigorous strain from the Griffiths lab, am1 ad-3B cyh-1 (FGSC #4564 - Perkins, Neurospora Newsl. 31: 41-42, 1984).
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Metzenberg, R. L.,
"Neurospora heterokaryons involving a thymidine kinase-positive "Helper": use in storing poorly viable strains or crossing strains of limited fertility,"
Fungal Genetics Reports:
Vol. 49, Article 10.