On the mechanistic side of things, <a href="http:&#x2F;&#x2F;www.pnas.org&#x2F;content&#x2F;112&#x2F;26&#x2F;8106.short" rel="nofollow">http:&#x2F;&#x2F;www.pnas.org&#x2F;content&#x2F;112&#x2F;26&#x2F;8106.short</a> is one of the more interesting papers to come out recently on ketamine&#x27;s mode of action.