RNA Expression in APoGE for Common Genes in Axon Guidance and Time Course Relevant Clusters. (4a), (4c), (4d), (4g), (4h), (4i), (4j), (4k), (4q), (4r), ventral view. (4b), (4f), (4l), (4m), (4n), (4o), (4p), (4s) and (4t), lateral view. (4a) CycA is a cell cyclin whose mutants have severe defects in the commissures and longitudinal axon tracts of the CNS . (4b) CycB3 is a cell cyclin, required for spindle organization. (4c) cdc2 is a cell cyclin; cdc2 mutants have CNS defects . (4d) fizzy is involved in cell cycle and mutants result in degeneration of CNS and absence of PNS. (4e) mei-S332 is a gene involved in meiosis and mitosis. (4f) G-ialpha65A is involved in mitosis and is also involved in CNS development. (4g) lola is a transcription factor required for axon guidance. (4h) Df31 is involved in chromatin remodelling. (4i) Set is involved in DNA replication with reported cyclin binding characteristics. (4j) dUTPase is involved in nucleic acid metabolism. (4k) scalloped (sd) is involved in wing development and in CNS development. (4l) Chrac-16 is a member of the chromatin accessibility complex. (4m) Su(var)2–10 is involved in chromosome organization and biogenesis. (4n) Uch-L3 has been reported as a member of the regulatory complex of the 26 S Proteasome. (4o) BCL7-like and (4p) msb1l are genes for which little is known. (4q) CG15141, (4r) CG5175, (4s) CG8478, and (4t) CG31639 are genes with no functional information available but with the cell cyclin pattern of expression.