Gareth Griffith inquired about oomycete plasmids, the following references may be helpful: H.H. Prell (1990) Zentralbl. Mikrobiol. 145:485-494 F.N. Martin (1991) Current Genetics 20:91-97 It is my understanding that Helga Forster also has looked at some linear plasmids in Phytophthora. Frank Martin University of Florida