aLa Jolla Institute for Molecular Medicine, San Diego, and
bBurnham Institute for Medical Biology, La Jolla, Calif., USA;
cDepartment of Human Anatomy and Histology, University of Bari School of Medicine,
Bari, and
dDepartment of Genetics, Microbiology and Anthropology, University of Parma, Parma,
and Division for Experimental Oncology 2, National Cancer Institute Aviano, Aviano,
Italy