The neurons cultivated at Johns Hopkins—unlike those culled from tumors are not cancerous, and accordingly are much more valuable as research tools.

在约翰霍普金斯大学培养的神经元不同于那些从肿瘤中挑选出来的神经元，它们并没有癌变，因此作为研究工具更具价值。

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Some people who oppose cloning also object to the use of animals as research tools.

有些反对克隆技术的人也反对把动物作为研究工具。

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Some people who oppose cloning also object to the use of animals as research tools.

有些反对克隆的人，同样也反对用动物做实验工具。

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She says they are still considered research tools in the United States, and not used as much as in places like Britain and Japan.

VOA: special.2009.12.17

So, while stem cells still hold great promise for regenerative medicine, their use as tools for research and drug testing is having more immediate impact.

FORBES: Screening New Drugs With Stem Cells

The biggest question remains how quickly tests such as this will move from being essentially research tools to being real clinical tests that are conducted in commercial laboratories and are paid for by insurers.

FORBES: DNA Sequencing: Is Science Fiction Becoming Medical Fact?

The advent of modern research-and-development tools, such as 3D printers, has also helped to lower expenses, he adds.

WSJ: New Medical Devices Get Smart