L

labial (lab) gene 24, 25, 42, 85 expression in arthropod heads

138, 139 sequence conservation 224 lampreys branchial arches 174, 175 Hox genes 116, 117 neural crest 172-4 larvaceans 171-2

lateral plate mesoderm 83, 84, 241

limb bud positioning 89, 90 leeches, Hox expression patterns

139-40, 140 lens crystallins 229 Lepidoptera see butterflies leucine zipper 40, 41, 241 library screening 106 limb buds initiation 89, 90

organizers 18, 19

outgrowth and axial patterning

89-92, 90 positioning along rostrocaudal axis 89, 90 signaling proteins 50, 50-1 limb fields (primordia), Drosophila regulation of formation 73-4, 74 selector genes 29-30, 31 limbs arthropod abdominal segments 144-6,

145, 147 diversification 136, 136-8, 137

bilaterian, evolution 127 insect diversification of homologous

151-2, 152, 153 repression on abdomen 144-6, 145 mechanisms of diversification

143-4 vertebrate 175-8, 176 development 87-95, 88 diversification 133, 153-4, 155

homology 10, 12 Hox gene deployment 89,

92-4, 93 intraspecific variation in morphology 232, 233 loss in snakes 179-80, 181 modularity 8, 9 proximodistal axis formation 92-4

regulatory networks controlling differentiation 94

selector genes controlling identity 94-5, 95 lin-48 gene 230 "living fossils" 105 lizard forelimb 12 Lmx genes 42, 49 Lmx1b protein 91, 91 logic, genetic regulatory 59, 60, 60-1

lophotrochozoans 241 Hox genes 114-16, 115 phylogeny 6, 7, 107 Lunatic fringe gene 85 Lytechinus variegatus 227

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