a mass of undifferentiated cells from which an organ or body part develops
例句与用法
1.
Blastema in wt consists of sheets of densely packed small blue cells with hyperchromatic nuclei , little cytoplasm and conspicuous mitotic actiity 后肾胚芽由密集排列的片状小蓝色的细胞构成,核染色质粗糙,胞浆稀少,有丝分裂像明显。