Cultures of disaggregated tissue that can be maintained and propagated for use in research. Cells in the same line are typically clones. The length of time cells will survive in culture varies. Some cell lines are immortalized; that is, they can be maintained essentially indefinitely, for one of a variety of reasons. Embryonic stem cells and embryonic germ cells are immortal because they express telomerase, one of the factors necessary for cells to propagate normally.
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