A circuit motif in the zebrafish hindbrain for a two alternative behavioral choice to turn left or right.

In 14 cases where we filled the three neurons (10 with prior physiology and 4 only labeled anatomically to minimize cellular damage) and reconstructed them in 3D from confocal optical sections, every feedforward neuron had more boutons contacting the contralateral M-cell than the ipsilateral one, with a highly significant difference between the two sides ( Figure 1B5 ; p<0.0001).

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