Stems can be oval.Logical formLearned from7 sentences. Stems can be smooth.Logical formLearned from7 sentences. A (stem cell treatment) can be embryonic.Logical formLearned from7 sentences. A stem may end in a vowel.Logical formLearned from7 sentences. A beginning may pertain-to a stem.Logical formLearned from7 sentences. A herb may produce an (erect stem).Logical formLearned from7 sentences. (Stem rust) can be on wheat.Logical formLearned from7 sentences. Stems may pertain-to a tree.Logical formLearned from7 sentences. A (brain stem) can be intact.Logical formLearned from7 sentences. A stem may be unbranched.Logical formLearned from7 sentences. (Stem cells) may undergo an implantation.Logical formLearned from7 sentences. (Stem cell research) may take place.Logical formLearned from7 sentences. A stem can be perennial.Logical formLearned from7 sentences. Nodes can be on a stem.Logical formLearned from7 sentences. (Stem cells) may be derived from a (bone marrow).Logical formLearned from7 sentences.