美国科学家发现一种新型感光细胞。原先人们一直认为,只有杆状细胞和锥状细胞才是能将光能转变成电脉冲的光感受器。科学家认为,新发现的细胞在调节生物钟的工作方面起着重要作用。新发现的细胞位于视网膜中比杆状细胞和 American scientists have discovered a new type of photoreceptor cells. It was previously believed that only rod cells and cone cells are photoreceptors that convert light energy into electrical pulses. Scientists believe that newly discovered cells play an important role in regulating the work of the biological clock. The newly discovered cells are located in the retina more than rod cells and