source: [lemma=cell] ([lemma=type] | [□=□]) □ □
destination: [lemma=cell] ([lemma=type] | [tag=□]) □ □
spec: Embryonic stem cells ( ES cells ) may hold the most promise for treating diseases , because they are pluripotent : they can grow and divide , or differentiate , into any cell type found in the fetus and adult . At critical points in their histories , it has been enormously important that the news divisions were run by individuals with vision and the credentials to stand up to their network bosses - Roone Arledge at ABC , Reuven Frank at NBC and Richard Salant at CBS to name only a few .