secondary yolk cells 次级卵黄细胞
Yolk sac hemopoietic stem cells 即卵黄囊造血干细胞
yolk sac stem cells 卵黄囊干细胞
The yolk, though very high in cholesterol, is also high in choline, which is a very important building block of brain cells.
蛋黄虽然胆固醇含量很高，但其也富含胆碱，而胆碱是一种组成脑细胞的重要物质。
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