A complex neural structure in seahorses (11)

I believe the answer is:

hippocampus

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But I can't explain it at all! Could you help me understand?

(Other definitions for hippocampus that I've seen before include "Might this emotional centre" , "A bit of brain brings" , "One needs a bit of brain" , "area of the brain" , "part of the brain?" .)

I've seen this clue in The Hindu.

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