Proliferative Response of H‐2 Incompatible Leukocytes to an Abelson Virus‐Induced Lymphoma Cell Line Apparently Not Expressing Ia‐Antigens

Abstract
The proliferative response of normal lymph node cells from different mouse strains to an Abelson virus-induced leukemic cell line (MLVA) in mixed leukocyte culture (MLC) was investigated. MLVA leukemic cells stimulate a specific response. The stimulating determinants are probably controlled by genes in the K-end of the H-2 complex. Using 2 different anti-Ia sera and different assay systems, it was impossible to detect the expression of Ia-antigens on MLVA. An alloantiserum raised against MLVA, and absorbed with P815, a non-stimulating mouse mastocytoma cell line, showed no residual activity against MLVA cells.