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Fig. 1. Electroretinograms of shakB2 and ogrecb8 animals. ERGs of both mutants are defective in on- and off-transients, suggesting a reduction in or loss of functional chemical synaptic connections between the retina and lamina in these mutants. (A) ERG of wild-type (Canton-S) flies, vertical arrows mark the on- and off-transients, respectively. (B) ERG of shakB2 animals. (C) ERG of ogrecb8 animals.