Monday open question: bias in hiring from elite universities?

Ever since complaining about the fact that half of the Salk faculty candidates this year were from Harvard/MIT, people have been forwarding me their experience.

We have:

Harvard: 1/5 from Harvard itself, 3/5 from UCSD

UCSF: Mainly Harvard/Stanford/MIT

University of Washington: Mix; 1 Harvard, 1 UIUC, 1 U Georgia, etc

Rockefeller: 3 UCSF, 2 Stanford, 2 Harvard, 1 Caltech, 1 Scripps, 1 UChicago, 1 UMich, 2 “europe”

So: Harvard’s well represented, even among itself. The question is, is that representative of the role it plays in neuroscience research?