The circular pigmented membrane behind the cornea, perforated by the pupil; the most anterior portion of the vascular tunic of the eye, it is made up of a flat bar of circular muscular fibers surrounding the pupil, a thin layer of smooth muscle fibers by which the pupil is dilated, thus regulating the amount of light entering the eye, and posteriorly two layers of pigmented epithelial cells. (BRENDA Tissue and Enzyme Source Ontology, BTO_0000653)
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21 genes co-occuring with the biological term iris in literature-supported statements describing functions of genes from the GeneRIF Biological Term Annotations dataset.
