The paper 10.1093/cercor/BHR145, ‘Rac1-dependent cell cycle exit of MGE precursors and GABAergic interneuron migration to the cortex’', by Vidaki et al., published in Cerebral Cortex issue 22(3) (2012), was originally published with a standard copyright line, but has since converted to Open Access in order to comply with MRC funding regulations.”