In lower vertebrates, the pineal gland has an eye like structure and it functions as a light receptor and is considered by some to be the evolutionary forerunner of the modern eye.
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- 在较低等脊椎动物里,松果体有一个类似眼睛的结构而它的功能如同光的受体,一些人认为是现代眼睛进化早期的样子。