Just today NIH posed a FAQ for the Challenge grant
http://grants.nih.gov/recovery/faqs_challenge.html#b3

The answer to The Biosketch question is:

Does the 2-page limit and 10-publication limit on Biographical Sketches
apply to a) all three sections of the Biographical Sketch; and b) all Key
Personnel or just the Principal Investigator?

Yes, the 2 page limit includes all three sections of the Biographical Sketch
(A: Positions and Honors, B: Selected peer-reviewed publications or
manuscripts in the press, and C: Research Support), and the number of
publications cited in the PD/PI’s biosketch is limited to ten or fewer
items. PD/PIs should cite their most relevant publications and those that
highlight the significance of past accomplishments. These limits apply to
biosketches for all key personnel as well as the PI.

~BURCH

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