What is the role of the Rahi in Mata Nui's functioning?

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1

Greg Farshtey said

Rahi can be revived, since they play a role in Mata Nui’s functioning as well.
-BZP, Red Stars Revelations (http://www.bzpower.com/board/topic/6878-update-1017-red-star-revelations/)
So, what is the role of the Rahi in the functioning of the Great Spirit Robot?

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9

If I recall correctly, the idea was that Rahi essentially functioned like white blood cells in the body.

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