Methods The lymphocytes and subsets of cord blood were separated and cultured. DNA synthesis and K 562 cell activity were measured by 3H TdR,the hematopoietic ability of stem cells was observed by colony culture.

• 方法 对脐血T淋巴细胞及其亚群分离、培养 ,LDR后用3 H 胸腺嘧啶核苷 (3 H TdR)掺入法观察其DNA合成和抗肿瘤细胞K562 活性 ,集落培养观察脐血干细胞造血能力。