The extracellular matrix that is a regularly spaced circumferential ridge present in the cortical region of the cuticle. Annuli are delineated by annular furrows and are present throughout the cuticle with the exception of lateral regions where longitudinal alae are present. (Gene Ontology, GO_0060107)
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31 genes co-occuring with the biological term annulus in literature-supported statements describing functions of genes from the GeneRIF Biological Term Annotations dataset.