These hormones (delivered through the blood stream) are produced in very specific clumps of cells (islets).

这些激素（经由血液运输）是特定细胞（岛）组产生的。

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Various clumps of cells in the brain stem determine the brain's general level of alertness and regulate the vegetative processes of the body such as breathing and heartbeat.

脑干各种细胞簇决定脑的反应和控制身体生长过程例如呼吸和心跳的总体水平。

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However, in some cases, the cells formed clumps of cancerous tissue called teratomas, a major safety concern with stem cell therapies.

然而，某些情况下，这些细胞形成了称作畸胎瘤的癌变肿块，这也是干细胞疗法的一个主要安全问题。

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One place they found a difference was in the amygdalae, two almond-shaped clumps of cells deep in the brain, one on each side.

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These nodules are usually clumps of thyroid cells that are growing abnormally within the gland.

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Edwards noted that stem-cell work uses blastocysts containing clumps of 16 or 32 cells that were collected by fertility clinics but are no longer needed and would otherwise be thrown away.

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