Methods A total of 198 cases of Ph(+) CML and 20 normal controls were studied by silver staining the nucleolar organizer regions (Ag-NOR) of fixed mataphase chromosomes to bone marrow cells.

• 方法 用硝酸银染色法 ；对 198例Ph(+ )CML患者及2 0名正常对照进行骨髓细胞银染核仁组织者区 (Ag NOR)频率的研究 .