By Sabine Vollmer, The News & Observer, Raleigh, N.C. Jun. 21--Donald Holzworth, the top executive and majority owner of the Constella Group, signed papers Wednesday to sell the Durham health services company he started 25 years ago to SRA International of Virginia.

MILWAUKEE _ The medical research company hired by the federal government four years ago to update its list of carcinogens moved quickly to add a virus to the list while two of its clients were developing vaccines to combat that same virus. Today those clients _ Merck & Co.

By SUSANNE RUST and CARY SPIVAK The medical research company hired by the federal government four years ago to update its list of carcinogens moved quickly to add a virus to the list while two of its clients were developing vaccines to combat that same virus. Today those clients - Merck & Co.

By Susanne Rust and Cary Spivak, Milwaukee Journal Sentinel Apr.

Constella Group, a global professional health services company, announced today that it has named Paul Nedzbala chief operating officer of its Health Sciences business unit.