 activin receptor-like kinase 1 (ALK1) and are not infected with EBV and therefore do not express this virus's EBER or BART RNAs.Unlike PBL, the plasmablastic cells in human herpesvirus 8-positive diffuse large B-cell lymphoma, not otherwise specified express products of herpesvirus 8 (also termed Karposi sarcoma virus) such as LANA-1 protein.Also unlike PBL, these plasmablastic cells do not express CD30, CD138, CD79a, or a clonal IgM antibody and usually are not EBV-infected and therefore usually do not express this virus's EBER or BART RNAs.