The nematode worm (Caenorhabditis elegans) is a very small worm, verging on the microscopic (~0.1mm in length). Developmental biologists (among other biologists) love it because all adults have the same number of cells (94), and it develops in a simple fixed order. It also has a very simple nerve system, which is fully understood.

In December 1998, C. elegans became the first multicellular organism to have its genome completely sequenced (by the UK's Sanger Centre); see: C. elegans: Sequence to Biology, Science Dec 11 1998 (entire issue).

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