Cichlids have some of the most incredible visual systems known. Humans have genes that code for three different types of visual pigments, called opsins. Cichlids have seven.
慈鲷有最非凡的视觉系统。人类有这种基因，有三种不同的类型的视色素，称为视蛋白。慈鲷有七种。
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