nematode worm caenorhabditis elegans brain,caenorhabditis elegans c. elegans,nematode worm c elegans,are nematodes worms,aging in the nematode caenorhabditis elegans,do nematodes harm earthworms,do nematodes kill worms,nematode worm caenorhabditis elegans,fig 3.1 shows the nematode worm caenorhabditis elegans,do nematodes eat worms