(Stem cells) may develop into red (blood cells).Logical formLearned from7 sentences. (Stem cell research) may be conducted.Logical formLearned from7 sentences. Stems may be covered with hairs.Logical formLearned from7 sentences. Adult (stem cells) may be found in tissues.Logical formLearned from7 sentences. An ability may pertain-to (stem cells).Logical formLearned from7 sentences. (Stem cells) can be from umbilical cords.Logical formLearned from7 sentences. Clusters can be constituted-of-or-filled-with stems.Logical formLearned from7 sentences. A stem may lengthen.Logical formLearned from7 sentences. Sides may pertain-to a (stem cell debate).Logical formLearned from7 sentences. (Stem cell derivatives) can be embryonic.Logical formLearned from7 sentences. Stems can be crooked.Logical formLearned from7 sentences. A canker can be on a stem.Logical formLearned from7 sentences. Umbilical-cord blood may contain (stem cells).Logical formLearned from7 sentences. (Stem cells) may undergo an expansion.Logical formLearned from7 sentences. A (brain stem) may control functions.Logical formLearned from7 sentences.