State Street Corp. believes market conditions will make it difficult for his Boston company to maintain its strong second-quarter growth, but he hopes to weather the second half by focusing on core businesses, cutting expenses and attracting new customers.

"We expect the uncharacteristic growth to moderate," Ronald E. Logue, State Street's chairman and chief executive officer, said in an interview. "The foreign exchange growth has moderated, and we expect net interest margins to increase only slightly."

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