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1Turku Centre for Biotechnology, University of Turku, Åbo Akademi University, BioCity, FIN-20521 Turku, Finland and Department of Biology, Åbo Akademi University, BioCity, Turku, Finland
1Turku Centre for Biotechnology, University of Turku, Åbo Akademi University, BioCity, FIN-20521 Turku, Finland and Department of Biology, Åbo Akademi University, BioCity, Turku, Finland
2Turku Centre for Biotechnology, University of Turku, Åbo Akademi University, BioCity, FIN-20521 Turku, Finland
Received 1999 May 11; Revised 1999 May 19; Accepted 1999 May 19.