G2.1 Earthworm leukocytes (CD11a+, CD45RA+, β2-m+, Thy-1+) can kill human K562 tumor cell targets: E. L. Cooper1,2, M. M. Suzuki1, A. Cossarizza2, S. Salvioli2, M. Capri2, D. Quaglino2, I. Pasquali-Ronchetti2, C. Franceschi2 1Lab. of Comparative Immunology, Dept. of Anatomy and Cell Biology, University of California, Los Angeles, CA 90024, USA, 2Section of General Pathology, Dept. of Biomedical Sciences, University of Modena, Modena 41 100, Italy