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cheshunt | 16:55 Sat 04th Mar 2006 | Quizzes & Puzzles
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Specialised type of neuron that absorbs photons and converts them to signals that can be recognised by the brain. - H - T - R E - E - T - R
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Photoreceptor
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Thanks JimJools. I had twigged to the receptor ending but couldn't get the beginning.

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