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have been described. They might thus reveal adaptation processes that are
necessary for ectomycorrhizal function.
Acknowledgements I am indebted to Magret Ecke and Andrea Bock for excellent technical
assistance and to Dr. Mika Tarkka and Dr. Rüdiger Hampp for critical reading of the
manuscript. This work was supported by the Deutsche Forschungsgemeinschaft (DFG-
Schwerpunkt Mykorrhiza).
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