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。

youdao

But this study finds that most of these children already had an outpatient provider, so accessing care isn't the rate-limiting factor.

她说，“但是这次的研究发现，大部分儿童都有一位专属的门诊医生，所以上门问诊的医生数量并不是限制因素。”

youdao

That was the rate limiting step.

那是速率限定步骤。

youdao

This is one of the merits in such an all-inorganic system while some conventional systems cannot follow the light power in general because of their internal or external rate-limiting processes in the complex structures.

ENGADGET: Panasonic Photosynthesis System converts carbon dioxide to organic material with plant-like efficiency

The system is self-limiting because at some point, a very aggressive lender will overshoot, and lend at a rate at which they are not profitable.

FORBES