Essential alterations of heparan sulfate during the differentiation of embryonic stem cells to Sox1-enhanced green fluorescent protein-expressing neural progenitor cells. - Johnson CE; Crawford BE; Stavridis M; Ten Dam G; Wat AL; Rushton G; Ward CM; Wilson V; van Kuppevelt TH; Esko JD; Smith A; Gallagher JT; et al. (Stem cells (Dayton, Ohio), 2007)