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Inoculation of tomato (Lycopersicon esculentum) with an avirulent race of Cladosporium fulvum results in a substantial increase in extra- and intracellular chitinases and β-1,3-glucanases in the host. In this communication we describe the purification of a 27 kDa, extracellular chitinase [isoelectric point (pI) <4.8] and two intracellular chitinases (30 and 32 kDa, pI 9.1 and pI > 10, respectively),...