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C. elegans mutant worm, light micrograph
C. elegans worm. Differential interference contrast micrograph of a rolling mutant Caenorhabditis elegans worm. Rolling mutants move in a circular, rather then the normal sinusoidal, path. The lawn of Escherichia coli bacteria that the worm feeds on in the laboratory can be seen in the background. C. elegans is a soil-dwelling hermaphrodite nematode worm and one of the most studied animals in biological and genetic research. A tendency to reproduce by self-fertilisation (resulting in identical offspring), along with the short time taken to reach maturity, make this tiny worm an ideal subject.
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