BOULDER, Colo.--Bioinformatics company Genomica here has announced that Arnold Levine, a codiscoverer of the p53 tumor suppressor gene, has joined the company's board of directors. In addition, the company made two other key staff appointments. Levine is professor of the department of molecular biology at Princeton. Thomas Marr, Genomica's president and CEO, observed, "his scientific expertise is a tremendous asset and will help direct the company as we expand our product base."