I had one sandwhich in an OK journal and one just on the way to J. Neuroscience (which didn't come out for another two years!) when I interviewed, plus two abstracts at national meetings.
Most important: be facile with the WHY of your research (no one cares to hear about the PCR you did - just WHY you did it). For this, of course, it helps to have done research (you need something to talk about). Publishing is a bonus, but isn't really required.
Oh, and try to convey some excitement about your research (even if you're not going into that area).
Best of luck - this is a GREAT career.
Primate