R

radially symmetric animals 2, 183 radiation 243

Cambrian period 2 redundancy, genetic 46 -8, 241 region-specific selector genes 27, 243

regulatory circuit 60, 60-1, 243

regulatory evolution 213—37, 243 central importance 213—14 cis-regulatory elements and 215-30 reporter genes 57, 58, 243 repression, gene, evolution 222 repressors 56, 56-7, 243

segmentation genes 68-9 retinoic acid receptors 229 rhomboid (rho) gene 69, 70, 71 rhombomeres 85-7, 86, 243 rock pocket mouse 194, 194-5 rostrocaudal axis 83-5

Hox gene patterning 47, 85-7, 86

limb bud positioning 89, 90 runt gene 133

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