Areas may pertain-to a (brain stem).Logical formLearned from6 sentences. (Stem cells) may offer a promise of providding a source of cells.Logical formLearned from6 sentences. Some (stem cell lines) may have some problems.Logical formLearned from6 sentences. A machine may remove (stem cells).Logical formLearned from6 sentences. (Stem cells) may be destroyed.Logical formLearned from6 sentences. (Stem cells) can be flexible.Logical formLearned from6 sentences. Species may have a stem.Logical formLearned from6 sentences. Stems can be chopped.Logical formLearned from6 sentences. (Stem cells) may undergo preparations.Logical formLearned from6 sentences. A use of embryonic (stem cells) can be necessary.Logical formLearned from6 sentences. A stem may pertain-to a principal part.Logical formLearned from6 sentences. Director may pertain-to a (stem cell transplant program).Logical formLearned from6 sentences. A stem may point.Logical formLearned from6 sentences. A step can be in a development of (stem cells).Logical formLearned from6 sentences. A stem may be attached.Logical formLearned from6 sentences.