Palmitoylcarnitine, known to promote differentiation of neuroblastoma NB-2a cells as well as to inhibit protein kinase C (PKC) activity and to decrease phorbol ester binding, was shown previously to diminish the amount of complex formed between PKCdand its substrate GAP-43. In the present work we studied the effect of palmitoylcarnitine on the inter-action between PKCbII and its receptor RACK1.