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The NA60 experiment has studied muon pair production in p-A and In-Incollisions at the CERN SPS. We present new results on nuclear effects on J/psiproduction in p-A at 158 GeV, the same energy used for collecting A-A data atthe SPS. We then compare nuclear effects with previous results from fixedtarget experiments, and with the results obtained from a p-A data sample takenby NA60 at 400 GeV. Based on the 158 GeV results, we calculate the expectedJ/psi suppression in In-In and Pb-Pb collisions due to cold nuclear mattereffects, and we extract a new estimate for the anomalous suppression at SPSenergies. Finally, we show preliminary results on J/psi polarization in p-Acollisions.

J/psi production in p-A collisions at 158 and 400 GeV: recent results from the NA60 experiment