To differentiate, the fork system call returns 0 in the progeny but returns the process ID of process Z to the progenitor.
为了以示区别，fork系统调用在子进程中返回0，但返回给父进程的却是进程z的进程ID。
Specifically, they found the virus in hematopoietic progenitor cells (HPCs) -the mother of all immune system cells.
尤其是在定向造血干细胞(所有免疫系统细胞的母体)中找到了病毒。
It could differentiate into various hemopoietic progenitor cells, and in the lifetime provided new cells for hemopoietic system.
其主要功能是通过不断分化产生各系造血祖细胞，终生为造血系统提供新细胞来源。
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