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Experiments that led to the hunt for guidance cues<br />
• Shine a light on retina, record electrical activity from tectum<br />
• a cell in one part of the retina always produced activity in a<br />
particular part of the tectum<br />
• Inject a visible label into neurons<br />
• an injected cell from the retina always projected to a<br />
particular place in the tectum<br />
Conclusion: Cells<br />
in retina have<br />
specific targets<br />
in the tectum