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Iris
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| style="height:20px; width:400px; text-align:center;" |A [[diagram]] of the [[eye]] including the [[iris]].
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===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Iris of the eye, page 44, GCSE Biology, Pearson, Edexcel '']