Fletcher and Rorth have recently discovered that the phenotypes reported in this paper were due to loss of function of both stathmin and the adjacent gene arc-p20, encoding an Arp2/3 component. The mistake was due to use of an incorrect arc-p20 rescue construct as well as mistakes in the subsequent fly crosses. The true stathmin loss-of-function phenotype is quite mild. The authors have confirmed this new result by generating a clean stathmin knockout through homologous recombination. Because the authors cannot cleanly attribute the originally observed effects to Stathmin, they therefore retract the paper. The authors are very sorry for this mistake and apologize for any inconvenience it might have caused.
The retracted paper is here.