淋巴细胞的干细胞，在胎生期来自肝脏，出生后则由骨髓产生。

The stem cells of lymphocytes are in the liver in fetal development and in the bone marrow in postnatal life.

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他们发现这种敲除基因的小鼠骨髓中的淋巴细胞较正常鼠少50%，产生特异免疫细胞的胸腺较正常鼠少80%。

They found that the knockout mice had 50 percent fewer lymphocytes in their bone marrow and 80 percent fewer in their thymus, a collection of glands that helps produce specialized immune cells.

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骨髓是骨的疏松部分，血细胞和淋巴细胞都在其中产生。

Marrow is the spongy center of bones where blood cells and lymphocytes are formed.

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