EMBO reports (2002) 3, 443–450. doi: 10.1093/embo-reports/kvf098
It has come to my attention that a proper laboratory notebook is not available as evidence to support the findings on which this article is based. This constitutes non-adherence to ethical standards in scientific research. In accordance with the recommendations from the National Institute of Advanced Industrial Science & Technology, I therefore wish to retract this paper. H.K. declines to be party to this retraction as he maintains that all the data contained in the report are valid.