Cells can be from embryonic (stem cells).Logical formLearned from8 sentences. Aspects can be constituted-of-or-filled-with (stem cell biology).Logical formLearned from8 sentences. Stems can be round.Logical formLearned from8 sentences. A (brain stem) can be a part of a brain.Logical formLearned from8 sentences. Stems can be weakened.Logical formLearned from8 sentences. (Stem cells) may circulate in blood.Logical formLearned from8 sentences. A hurdle can be in a generation of (stem cells).Logical formLearned from8 sentences. An area may pertain-to a (brain stem).Logical formLearned from8 sentences. A necessity can be for (stem cell research).Logical formLearned from8 sentences. A male may decide on (adult stem cell therapy).Logical formLearned from8 sentences. Stems may pertain-to roses.Logical formLearned from8 sentences. (Stem cells) may be extracted from circulatting blood.Logical formLearned from8 sentences. A stem can be nice.Logical formLearned from8 sentences. A (stem pipeline) may begin at a level.Logical formLearned from8 sentences. (Cancer stem cells) may undergo a discovery.Logical formLearned from8 sentences.