A sheath can be around a stem.Logical formLearned from11 sentences. (Stem cells) can be male.Logical formLearned from11 sentences. A stem can be mature.Logical formLearned from11 sentences. Stems can be solid.Logical formLearned from11 sentences. A stem can be rounded.Logical formLearned from11 sentences. A stem can be oblique.Logical formLearned from11 sentences. A stem can be basic.Logical formLearned from11 sentences. A stem may undergo a substitution.Logical formLearned from11 sentences. (Stem cells) may undergo a regulation.Logical formLearned from11 sentences. (Stem cells) can be important.Logical formLearned from11 sentences. A use of embryonic (stem cells) can be controversial.Logical formLearned from11 sentences. (Stem cells) can be endogenous.Logical formLearned from11 sentences. A (stem cell policy) may pertain-to an administration.Logical formLearned from11 sentences. A (stem cell policy) may pertain-to a president.Logical formLearned from11 sentences. Transplants can be constituted-of-or-filled-with (stem cells).Logical formLearned from11 sentences.