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Nature. 1994 Feb 3;367(6462):429-34.

Pair-rule expression patterns of even-skipped are found in both short- and long-germ beetles.

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  • 1Department of Embryology, Carnegie Institution of Washington, Baltimore, Maryland 21210.


Now that the genes controlling embryonic patterning have been identified in several model organisms, long-standing questions concerning the evolution of developmental systems are open to investigation. Examination of the expression of even-skipped in a variety of insects reveals that Insect germ-type designations apparently do not reflect the variations in the mechanisms of segmentation evident throughout insect phylogeny.

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