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Fig. 6. Homozygous imc and spt tadpoles failed to swim towards shaded areas and against gravity. (A-C) Diagrams of the apparatus; (A) top view; (B,C) side views. (A,B) For phototaxis assays Petri dishes were half shaded (black) and larvae were placed in the shaded area and their response monitored. (C) For geotaxis assays tadpoles were placed in Petri dish containing 60 ml filtered seawater with antibiotics. A second Petri dish was suspended on top of the first dish at a height of 1 cm to sandwich the larvae between two potential settling surfaces. (D,E) Percentage of tadpoles settled on either dark (black) or illuminated (white) area. (F,G) Percentage of tadpoles settled on either top (black) or bottom (white) of the apparatus.





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