A comment on the origin of the vertebrate eye.
Satir
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D000818:Animals; D005075:Biological Evolution; D002816:Chordata, Nonvertebrate / Q000033:anatomy & histology*; D005123:Eye / Q000033:anatomy & histology*; D012160:Retina / Q000033:anatomy & histology; D014714:Vertebrates / Q000033:anatomy & histology*