CD4 and neoplasm: End-stage tumours on the diaphragms of CNP mice induced with Cre +/- asbestos were stained for expression of CD4 (helper T cells), CD8 (effector T cells), CD45R (aka B220, expressed on B lymphocytes), NKp46 (NK cells), Ly6G (granulocytes, primarily neutrophils) and F4/80 (macrophages) to identify tumour-infiltrating leukocytes.