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 (33)the 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