7Hermann Ehrlich et al.
ACKNOWLEDGMENTS
This work was partially supported by a joint RussianGerman program “DAAD–Mikhail Lomonosov.” We thank Professor H. Lichte for the possibility to use the facilities at the Special Electron Microscopy Laboratory for highresolution and holography at Triebenberg, TU Dresden, Germany. The authors are deeply grateful to Patrice Waridel and Andrei Shevchenko (Max Planck Institute of Molecular Cell Biology and Genetics, Dresden) for the identification of collagen in the composition of spicules, and also to Timothy Douglas, Heike Meissner, Gert Richter, Axel Mensch, and Ortrud Trommer for helpful technical assistance.
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