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Mean (±SD) tilt angle for five groups of tadpoles. No no current condition, U untreated condition, C cobalt-treated condition, S streptomycin-treated condition, G gentamicin-treated condition. Tadpoles in groups U, C, S, and G were all tested under current. Each tadpole was tested only once, and contributed only one data point to these graphs. Non-parametric analysis of variance showed significant differences in tilt angle between the five groups
