Donald McCarren has resigned as president and chief operating officerof Cambridge, Mass.-based ImmunoGen Inc. effective immediately.He will not be replaced.Synergen Inc. of Boulder, Colo. has appointed Gregory Abbottpresident and CEO.Focal Inc., of Cambridge, Mass., has appointed Bradford Smith vicepresident, finance.Glycomed Inc., of Alameda, Calif., has named Brian Atwood CEO. Hesucceeds Alan Timms, who will continue as chairman of the board.

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