A source may pertain-to (stem cells).Logical formLearned from22 sentences. (Stem cells) may undergo populations.Logical formLearned from22 sentences. A stem can be modified.Logical formLearned from22 sentences. A person may oppose (stem cell research).Logical formLearned from22 sentences. (Stem cells) can be from (cord blood).Logical formLearned from22 sentences. Stems can be modified.Logical formLearned from21 sentences. Stems can be black.Logical formLearned from21 sentences. Work can be on (stem cells).Logical formLearned from21 sentences. (Stem cells) may be collected.Logical formLearned from21 sentences. Stems can be clear.Logical formLearned from21 sentences. (Stem cell research) may undergo an expansion.Logical formLearned from21 sentences. A person can be a supporter of (stem cell research).Logical formLearned from21 sentences. A (stem cell science) can be embryonic.Logical formLearned from21 sentences. Stems can be swollen.Logical formLearned from21 sentences. Stems may grow.Logical formLearned from21 sentences.