The court heard Buckley recruited chemists Zhang and Hu from China to help set up a laboratory.

BBC: Merseyside gang sentenced over ?6m drugs plot

Chongqing Holley, a sister company of Kunming's, has set up a research laboratory in Hunan to help it identify high-yielding plants and establish a seed bank.

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Between 1999 and 2008 a laboratory in California was set up to do just that.

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In their laboratory his team has set up a one-gallon-a-day production facility, which uses between 19kg and 26kg of coffee grounds.

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Even so, the Mars Society, an organisation set up to lobby for such a mission, plans to contribute a field laboratory to the Devon Island station.

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The gang rented a unit under a false name in Newton-Le-Willows where the laboratory was set up.

BBC: Merseyside gang sentenced over ?6m drugs plot