Instead of needing to be activated by a specific chemical messenger, the engineered fat cells are always active.

它们常常处于激活状态，而不需要受特殊化学信号激活。

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One party is Tencent, whose instant messenger QQ enjoys 612.5 million active users.

其中一方是腾讯，它的即时通软件QQ拥有6.125亿活跃用户。

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Along with this levels of another chemical messenger, which dampen down over-active cells, also begin to drop and it is these chemical levels which were boosted in the trial.

试验中伴随者过度活跃的细胞的破坏产生另外的化学信号水平的下降，可使多巴胺水平增加。

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To be sure, FarmVille is still easily the top app in terms of daily active users, at more than 16 million compared to the second-highest app Windows Live Messenger at nearly 10 million.

FORBES: FarmVille No Longer Facebook's Top Application