We erroneously double-published the article entitled “The integrin {alpha}9β1 on hematopoietic stem and progenitor cells: involvement in cell adhesion, proliferation and differentiation” by Schreiber et al. on October 1st with doi:haematol.006072. This article must be considered as retracted, as the correct version of the same article has been correctly published on Haematologica 2009; 94:1493–1501, as doi:10.3324/haematol.2009.006072.