We examine the census of star-forming galaxies and their extinction
properties at redshift z~2, when a large fraction of the stellar mass
in the universe formed. We find a good agreement between the X-ray,
radio, and de-reddened UV estimates of the average star formation rate
(SFR) for our sample of z~2 galaxies of ~50 Msun/yr, indicating that
the locally calibrated SFR relations appear to be statistically valid
from redshifts 1.5