以下为句子列表：
英文: Purification: Density Gradient Centrifugation (Sucrose &CsCl).
中文: 分离:密度梯度离心法(蔗糖&氯化铯).
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英文: The fetal liver stem cells were isolated by collagenase digestion, gravity sedimentation and density gradient centrifugation, identified by immunocytochemistry and evaluated by flow cytometry for their proliferation condition.
中文: 采用胶原酶消化、重力沉降及密度梯度离心方法分离人胎肝干细胞，通过免疫细胞化学方法对其进行初步鉴定，以及应用流式细胞仪等对其生长状况进行评估。
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