| 单词 | progress zone |
| 释义 | > as lemmasprogress zone progress zone n. Embryology a population of rapidly proliferating, undifferentiated cells at the distal tip of a developing vertebrate limb. ΚΠ 1973 D. Summerbell et al. in Nature 24 Aug. 493/2 A labile region [of a developing limb] where new positional values are successively engendered in the course of growth, we shall call a ‘progress zone’. 1975 Science 24 Jan. 229/1 The tip of a limb bud, which is called the progress zone, contains dividing cells, and the products of division form in strict sequence the various structures of the limb. 2003 New Scientist 29 Mar. 34/1 The new research calls this model into question. It proposes that there is no such thing as the progress zone. < as lemmas |
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