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Old 02-07-2013, 01:52 AM   #313
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Joined: Aug 2009
Location: Corvallis, Oregon
Oddometer: 93

I'm pretty sure it would be "affect".

You want to "affect" the action to bring about the desired "effect".

Here is an example from the interweb:

"Gender may affect the action of garlic oil on plasma cholesterol and glucose levels of normal subjects."
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