AltaRex Corp., of Waltham, Mass., appointed Hans Wigzell to its scientific advisory board.

Amrad Corp. Ltd., of Victoria, Australia, appointed Sandra Webb managing director.

Arakis Ltd., of Cambridge, UK, appointed Michael Redmond nonexecutive chairman.

AtheroGenics Inc., of Atlanta, appointed Robert Pollock director of regulatory affairs and Stephen Sudovar to its board.

Avalon Pharmaceuticals Inc., of Gaithersburg, Md., added Ingemar Lindell as vice president of business development.

Avalon Pharmaceuticals Inc., of Gaithersburg, Md., added Per Ingemar Lindell as vice president of business development.

Aventis Behring LLC, of King of Prussia, Pa., appointed Ulrich Delvos senior vice president, research and development and chief scientific officer.

Biocept Inc., of Carlsbad, Calif., added Charlotte Clark as chief business officer and executive vice president.

Cell Pathways Inc., of Horsham, Pa., added Stephen Carter, Anil Rustgi, Joan Schiller, Richard Schilsky and George Sledge to its scientific advisory board.

Cetek Corp., of Marlborough, Mass., added Douglas MacDougall as chief financial officer.

Chromos Molecular Systems Inc., of Burnaby, British Columbia, elected Michael Hayden and Jeff Tomlinson to its board.