1. Volume 101, Issue 6, Pages 577-580 (June 2000)
Endless Forms 
Sean B Carroll 
Cell 
Volume 101, Issue 6, Pages (June 2000)
DOI: /S (00)

2. Figure 1
The Evolution of Hox Gene Regulation Correlates with the Evolution of Axial Diversity
Among vertebrates, the relative positions of Hox gene expression such as Hoxc8 depicted here, have shifted along the primary body axis, at least in part, through evolutionary changes in cis-regulatory elements. Somites indicated by ovals. (From Belting et al. 1998; Cohn and Tickle 1999.)
Cell  , DOI: ( /S (00) )

3. Figure 2
Selection for Plant Morphology Acts upon Variation in Developmental Gene Regulation
The domestication of maize (right) from teosinte (left) selected for ear and plant morphology. Genetic analyses have revealed that selection acted upon regulatory elements of the tb1 gene. (Photos courtesy John Doebley.)
Cell  , DOI: ( /S (00) )

4. Figure 3 Variations in Limb Morphology within a Single Population
(A) The standard hindlimb morphology of Taricha granulosa, a salamander.
(B) Variations in mesopodial element morphology and number (shaded) found in a single population from a California pond.
(From Shubin et al )
Cell  , DOI: ( /S (00) )