An array can be constituted-of-or-filled-with stems.Logical formLearned from4 sentences. Chemotherapy may be followed by (stem cell rescue).Logical formLearned from4 sentences. (Stem cells) may migrate.Logical formLearned from4 sentences. A leaf may attach to a stem.Logical formLearned from4 sentences. Stems may be used.Logical formLearned from4 sentences. A debate can be on (stem cell research).Logical formLearned from4 sentences. Mechanisms may regulate (stem cell function).Logical formLearned from4 sentences. A reduction can be in a responsiveness of (brain stem respiratory centers).Logical formLearned from4 sentences. (Brain stem respiratory centers) may manifest responsiveness.Logical formLearned from4 sentences. Direct action can be on (brain stem respiratory centers).Logical formLearned from4 sentences. Mechanisms may control (stem cell fate).Logical formLearned from4 sentences. (Stem canker) can be a problem.Logical formLearned from4 sentences. (Stem cells) may undergo (survival characteristics).Logical formLearned from4 sentences. (Stem cells) may be isolated from (bone marrow).Logical formLearned from4 sentences. A (brain stem) may be involved in (blood pressure regulation).Logical formLearned from4 sentences.