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From: Dennis Drayna
Date: 21 Oct 2011
Time: 14:24:56 -0500
Remote Name: 165.112.47.66
As you'll notice in some of the posts above, it's clear that not all stuttering is genetic in origin. The best estimates we have suggest that genes explain something like 50-70% of stuttering. What explains the remaining 30-50% is mostly unknown at this point.