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The effect of ribosome-inactivating proteins (RIPs), either single-chain or toxins, was studied on plant ribosomes. RIPs did not affect ribosomes from their own plants, while inhibiting to a variable extent protein synthesis by heterologous plant ribosomes. Ricin stimulated and PAP—S inhibited the growth of carrot cells in culture.
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Battelli et al. (1984) studied this question.
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