Dear all, Does anybody know the commercial source or any other sources of 721.221 cell line ? I tried ATCC but they do not carry it. Thanks in advance. Aki Hoji University of Pittsburgh Department of Infectious Diseases and Microbiology Rm522 Parran Hall, GSPH-IDM 130 Desoto Street, Pittsburgh PA 15261 tel: (412) 624-3072/0776 fax: (412) 624-4953