This Expression of Concern relates to J. Cell Sci. (2001) 114, 435-443.

Journal of Cell Science was alerted to duplicated HPRT blots in Fig. 4A and Fig. 7C of this paper. The authors state that the conclusions of the paper are not affected by the duplicated control blots, but were unable to locate the original data from almost 20 years ago. Without the original full blots, the journal is unable to determine whether the results and conclusions reported in the paper are compromised.

The journal is publishing this Expression of Concern to make readers aware of these issues. The authors offer cell lines used in the paper for replication by any interested investigators and apologise to readers for any inconvenience caused.