Although advance has been made in the study on control of globin gene expression and switching, key factors of globin gene switching is still unknown till now.

虽然对于珠蛋白基因表达调控及开关的研究已取得许多进展，但至今对于调节这些开关的决定性调节因子仍不明确。

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For example, its Windows 8 Start key provides a quick and easy way to get back to your Start Screen, while the App Switching function key allows you to quickly switch among your open apps.

ENGADGET: Logitech's K810 keyboard pairs with up to three devices, has a button for switching apps in Windows 8

But since the first draft sequence of the human genome was released in 2000, scientists have realized that junk DNA plays a key role in switching genes on and off.

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Pre-Gerstner IBM kept adding key account sales people in hopes of keeping IT departments from switching out of mainframes to PCs.

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