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The b1 structure function is an observable feature of a spin-1 systemsensitive to non-nucleonic components of the target nuclear wave function. Thecontributions of exchanged pions in the deuteron are estimated and found to beof measurable size for small values of x. A simple model for a hidden-color,six-quark configurations (with~ 0.15% probability to exist in the deuteron) isproposed and found to give substantial contributions for values of x>0.2. Goodagreement with Hermes data is obtained. Predictions are made for an upcomingJLab experiment. The Close & Kumano sum rule is investigated and found to be auseful guide to understanding various possible effects that may contribute.

Pionic and Hidden-Color, Six-Quark Contributions to the Deuteron b1 Structure Function