That switch, which occurs just as the rats start to master the maze, likely signals that a habit has been formed, says MIT Institute Professor Ann Graybiel, senior author of the PNAS paper.
这个转变，就发生在当老鼠开始掌握了迷宫，可能也是行为形成的信号，麻省理工学院教授安·格雷比尔，同时也是美国国家科学院院刊高级作者，在文中说道。
JV: Your PNAS paper mentions that Balaur bondoc had large muscles around its pelvis area, as well as fused bones. How then would this dinosaur have moved?
珍：你在美国国家科学院院刊上的论文提到巴拉乌尔·邦多克龙的骨盆附近有着很大的肌肉，而且骨骼之间有着固定的连接。那么这种恐龙要如何移动呢？
As described in the PNAS paper, about one-third (29 percent) of people with a Factor H risk variant had not been diagnosed with AMD.
正如PNAS的一篇文章所描述的那样，大约三分之一（29％）携带因子H 突变的人没有患AMD。
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