Donaldson, Lufkin & Jenrette has laid off 23 mortgage- backed-securities traders, structurers, and researchers over the past two weeks, a spokeswoman for the firm confirmed Friday.

Mitchell Samberg, a managing director, was among those who were let go, the spokeswoman confirmed. Bruce R. Alpern, a senior vice president and head of mortgage and asset-backed research, was also dismissed, sources said.

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