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Fig. 11. A phototaxis-deficient phenotype of migrating slugs derived from 
cells. The light source is shown by the large arrows. Whereas slugs derived from non-EtBr-treated Ax-2 cells migrated almost directly towards the light source, slugs (
slug) derived from 
cells were highly disoriented. Phototactic behaviors of totally about 100 of respective slugs were traced, and the representative results of the slug no. 1-8 are shown in this figure. Bar, 1 cm.