Erythroid-specific 5-aminolevulinate synthase (ALAS2) catalyzes the rate-limiting step in heme biosynthesis.

红系特异的5-氨基酮戊酸合成酶（ALAS2）是血红素生物合成的限速酶。

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That was the rate limiting step.

那是速率限定步骤。

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Angiogenesis is a key limiting step in tumor growth and metastasis. The control of angiogenesis has emerged as an important mechanism of suppressing tumor growth.

血管生成是肿瘤生长转移过程中的一个关键环节，因此控制血管生成成为抑制肿瘤生长的重要途径之一。

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By upholding the mandate under the taxing power, they say, the Court has allowed the health care law to stand, but has also taken an important step toward limiting the power of the federal government by ruling, for only the third time since the FDR administration, that Congress exceeded its power under the commerce clause.

FORBES: Closing the Window, Opening the Barn Door

Limiting the Fed to a single target zero inflation would be a step in the right direction.

FORBES: Ben Bernanke's QE4: Another Step Toward Helicopter Money, And Away From Freedom

If the Clinton Administration has become a party to the Iraqgate cover-up, however, it can be expected to resort to the ultimate step: dropping some (if not all) of the charges against Christopher Drogoul in the hope of limiting further revelations.

CENTERFORSECURITYPOLICY: Center for Security Policy | ��Something Is Rotten In The State Of����? Why Is This Administration Joining The Bush Iraq Gate Cover-Up?