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One important outcome of the work on the expression of genes in developing embryos is sure to be knowledge that can help preventing birth defects. Just as promising 26 is the possibility of unraveling the complicated writing 27 of the brain. A mechanic gets valuable insight how an 28 automobile works by rebuilding car engines; similarly, neuroscientists can learn how the brain functions from 29 the way it is put together. The next step pursuing the 30 goal is to find out how the blueprint genes, the home box genes, control the expression of other genes that create the valves and piston of the working cerebral engine.
The protein encoded by the latter genes could change the 31 stickiness of the cell surface, the shape of the cell or its metabolism to create the characteristic peculiar to, say, neurons or neural-crest cell. Surface proteins may be the 32 mechanism, whereby similar programmed cells stick together to form specific structures; they might also sense 33the local environment to help the cell decide what is to do.
Clarifying those mechanisms will engage the best talents in 34 embryology and molecular biology for some times to come. 35 What is perhaps the most intriguing question of all is if the brain is powerful enough to solve the puzzle of its own creation.
参考答案：
26.preventing改为prevent
27.complicated改为complexion
28.sight后加into
29.neuroscientist改为a neuroscientist
30.pursuing后加in
31.later改为latter
32.similar改为similarly
33.去掉is
34.times改为time
35.if改为whether
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