Lymphoblasts are immature cells which typically differentiate to form mature lymphocytes. Normally lymphoblasts are found in the bone marrow, but in acute lymphoblastic leukemia (ALL), lymphoblasts proliferate uncontrollably and are found in large numbers in the peripheral blood. The size is between 10 and 20 μm.

淋巴母细胞是未成熟的细胞，这些未成熟细胞将分化形成成熟的淋巴细胞。一般地，淋巴母细胞是存在于骨髓中，但对于急性淋巴母细胞白血病（ALL），淋巴母细胞增殖失控，而且在外周血中大量地被发现。淋巴母细胞的大小是介于10～20μm。

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