San Diego-based MediciNova said this morning it has added two new members to its board of directors. The firm said that it has appointed Arlene M. Morris and Alan W. Dunton to its board. Morris is President and CEO of Affymax, and Dunton is chairman of ActivBiotics. Medicinova is a biopharmaceuticals company that is developing treatments for cancer, asthma, multiple sclerosis, and other conditions.