  We present Monte Carlo data for a linear chain with excluded volume subjected
to a uniform stretching. Simulation of long chains (up to 6000 beads) at high
stretching allows us to observe the signature of tensile blobs as a crossover
in the scaling behavior of the chain scattering function for wave vectors
perpendicular to stretching. These results and corresponding ones in the
stretching direction allow us to verify for the first time Pincus prediction on
scaling inside blobs. Outside blobs, the scattering function is well described
by the Debye function for a stretched ideal chain.
