1. Department of Gene ExpressionInstitute of Molecular Biology and BiotechnologyAdam Mickiewicz University Miedzychodzka 5 Poznan 60-371 Poland
2. Highlands Biological Station 265 Sixth Street Highlands North Carolina P.O. Box 580 28741 U.S.A.
3. Department of GeneticsInstitute of Experimental BiologyAdam Mickiewicz University Miedzychodzka 5 Poznan 60-371 Poland