A quark-cluster description of the EMC effect (Seminar given in the 18th Course of the "International School on Nuclear Physics", 16-23/9/'94, Erice, IT. To be published in Progress in Particle and Nuclear Physics, Vol. 34, Pergamon Press)

The response of a nucleus composed of nucleons and confined quarks is calculated in a non-relativistic cluster model and is shown to be a convolution of responses of, respectively, a nucleus with interacting point-nucleons and of a nucleon composed of quarks. We further show that the apparent off-shell energy in the expression for the nucleon structure function in Impulse Approximation does not constitue a real problem. We conjecture a generalization to the relativistic regime.

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