Teasers in full node view

Hi: I know there is a way to do the following, because I saw it on this site once; but I couldn't find it after a lengthy search. I am using FeedAPI to bring some copyrighted RSS feeds into my site; because of this, I need the nodes created by these feed items to render as teasers on both river pages (as usual) and also on the full node's dedicated page (i.e., mysite.com/node/XXXXX).

I'm sorry, but I've forgotten the syntax that sets this. Thanks in advance for reminding me --