23.1 Relationships among phyla

23.2 Modularity of development: morphogenetic fields

23.3 Modularity of development: enhancers

23.7 The same set of instructions forms the nervous systems of both protostomes and deuterostomes

23.8 Autopods of chicken feet and duck feet are shown at similar stages

23.9 Hox gene expression and morphological change in crustaceans (Part 1)

23.9 Hox gene expression and morphological change in crustaceans (Part 2)

23.10 The expression of Ubx and abdA (green) in the thoracic segments of different types of crustaceans

23.11 Model for the evolution of the feather by changes in the pattern of Bmp2 and Shh expression

23.12 Loss of limbs in snakes

23.13 GIS analysis of gene activity in the formation of the first set of cusps in mouse and vole molars

23.14 Basic model for cusp development in mice and voles (Part 1)

23.14 Basic model for cusp development in mice and voles (Part 2)

23.15 Allometry and modularity in the vertebrate eye

23.16 Neural crest cell migration patterns in lampreys and gnathostomes

23.17 Correlation between beak shape and the expression of Bmp4 in Darwin’s finches

23.18 Allometric growth in the whale head

23.19 Changes in Ubx protein associated with the insect clade in the evolution of arthropods

23.20 Co-option of signal transduction pathways in the formation of butterfly eyespots

23.21 Expression of a frog Distal-less gene in the mouse

23.22 Evolution of the mammalian middle ear bones from the reptilian jaw (Part 1)

23.22 Evolution of the mammalian middle ear bones from the reptilian jaw (Part 2)

23.24 Extra cervical ribs are associated with childhood cancers (Part 1)

23.24 Extra cervical ribs are associated with childhood cancers (Part 2)

23.25 Mechanism for the bottleneck at the pharyngula stage of vertebrate development

23.27 An emerging evolutionary synthesis