Cells may be observed.Logical formLearned from22 sentences. Cells may undergo maintenance.Logical formLearned from22 sentences. Cells can be (stem cells).Logical formLearned from22 sentences. A cell may grow.Logical formLearned from22 sentences. Cells may be harvested.Logical formLearned from22 sentences. Cells can be constituted-of-or-filled-with terrorists.Logical formLearned from22 sentences. Differences can be between cells.Logical formLearned from22 sentences. Clusters can be constituted-of-or-filled-with (nerve cells).Logical formLearned from22 sentences. Cells may pertain-to a host.Logical formLearned from22 sentences. Cells can be long-lived.Logical formLearned from22 sentences. Cells can be younger.Logical formLearned from22 sentences. White (blood cells) may undergo a proliferation.Logical formLearned from22 sentences. (Cell lines) can be mutant.Logical formLearned from22 sentences. Cells may be exposed to radiation.Logical formLearned from22 sentences. Cells may be selected.Logical formLearned from22 sentences.