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<p>which is programmed cell death. This makes C. elegans a <a href="page.php?w=model_organism">model organism</a> for studying cell lineage, and being able to observe the cell divisions due to their transparent phenotype.</p>

<p><big>History of cell lineage</big></p>
<p>One of the first studies of cell lineages took place in the 1870s by Whitman, who studied <a href="page.php?w=cleavage_%28embryo%29">cleavage patterns</a> in <a href="page.php?w=leech">leech</a>es and small <a href="page.php?w=invertebrate">invertebrate</a>s. He found that some groups, such</p><p>
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