title: A double lock on sister chromatids by cohesin.
abstract: In this issue of Molecular Cell, Farcas et al. (2011) demonstrate that intertwining between sister chromatids at metaphase is much more significant than previously thought and, remarkably, show that it depends on cohesin.
authors: Cell Cycle Group, Medical Research Council (MRC) Clinical Sciences Centre, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK. luis.aragon@csc.mrc.ac.uk
authors: Luis
authors: L
authors: Aragón