血小板(platelet)是成熟巨核细胞(megakaryocyte,MK)脱落的胞浆片段,没有细胞核。多年来一直认为,血小板所含蛋白成分是由MK合成的,与内质网、高尔基体、多糖体、信使RNA(messenger RNA,mRNA)等一样都是MK的残留成分。由于DNA位于细胞核内,所以血小板不可能将DNA转录为RNA,而转录又是高级真核细胞基因调控的首要控制 Platelets are cytoplasmic fragments of mature megakaryocyte (MK) shedding without nuclei. Over the years, it has been thought that the protein components of platelets are synthesized by MK and are the residual components of MK, like the endoplasmic reticulum, Golgi, polysaccharides, messenger RNA and the like. Because DNA is located in the nucleus, it is not possible for platelets to transcribe DNA into RNA, which is the primary control of gene regulation in higher eukaryotes