Regeneron Pharmaceuticals Inc., of Tarrytown, N.Y., said Chief Scientific Officer George Yancopoulos was elected to the National Academy of Sciences.

RegeneRx Biopharmaceuticals Inc., of Bethesda, Md., appointed Jo-David Fine and Claudio De Simone to its medical and scientific advisory board.

Semafore Pharmaceuticals Inc., of Indianapolis, appointed Donald Durden senior scientific adviser.

Serono SA, of Geneva, appointed Jacques Theurillat acting chief financial officer.

Structural GenomiX Inc., of San Diego, appointed Neill Giese senior vice president of drug development.

Tercica Inc., of South San Francisco, appointed Thomas Silberg chief operating officer.

Tissera Inc., of Tel Aviv, Israel, appointed Roy York Calne and Giuseppe Remuzzi to its scientific advisory board.