• Phylogix Inc., of Scarborough, Maine, added James McArthur as vice president, research and preclinical development.

• Protein Design Labs Inc., of Fremont, Calif., named Steven Benner senior vice president and chief medical officer.

• Ribapharm Inc., of Costa Mesa, Calif., appointed David Lawrence vice president, business development.

• Rigel Pharmaceuticals Inc., of South San Francisco, named Susan Scher vice president, strategic relations.

• Sagres Discovery Inc., of Davis, Calif., added Ali Fattaey as senior vice president, discovery research.

• Samaritan Pharmaceuticals Inc., of Las Vegas, added Erasto Saldi to its scientific advisory board.

• Structural Bioinformatics Inc., of San Diego, added Hanne Dannulat as European managing director.

• Transition Therapeutics Inc., of Toronto, appointed Paul Baehr and nominated Michael Ashton to its board. Baehr joins the board immediately and Ashton will stand for election Dec. 12.

• United Therapeutics Corp., of Silver Spring, Md., promoted Robert Roscigno to vice president of commercial development.

• Venture Investment Management Co., of Boston, named Daniel Pharand managing director.