Phenotypic characterization of F1 backcross of NZB × DBA/2. The mice were divided into LPD (right panel) and non-LPD (left panel) based on splenic histopathology. These values were ranked ordered in each group based on splenic weight. Data are presented for serum IgM level (IgM), peritoneal cell count, white blood count (WBC), RBC, MCV, and percentage of reticulocytes.