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Reference.org
Vertebrate visual opsin
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<p>Vertebrate visual opsins are a subclass of <a href="/facts/Ciliary_opsin/5kBeewYI">ciliary opsins</a> and mediate <a href="/facts/Visual_system/QVcuA27K">vision</a> in vertebrates. They include the opsins in human <a href="/facts/Rod_cell/mNd9Sf1E">rod</a> and <a href="/facts/Cone_cell/JoQeEzoF">cone cells</a>. They are often abbreviated to <i>opsin</i>, as they were the first <a href="/facts/Opsin/5kBeewYI">opsins</a> discovered and are still the most widely studied opsins. </p>