DMT is in the bark, but often with small twigs impossible and pointless to separate ... This might be one of the reasons that the percentages seem to differ from one extraction to another. 1/2 inch (20mm) thick branches and over can be smashed with a hammer to remove just the bark. A coffee grinder is great to powderise the bark..
Hope this helps...
G
One can never cross the ocean without the Courage to lose sight of the shore