Send correspondence to:
J.T. Seto Department of Microbiology California State University Los Angeles, Los Angeles California, 90032-8201 Tel:81-3-5285-1169 or 213 343 2034 Fax: 81-3-5285-1169 or 213 343 6451 E-mail: mtashiro@nih.go.jp or jseto@calstatela.edu