| Dataset | COMPARTMENTS Curated Protein Localization Evidence Scores |
| Category | structural or functional annotations |
| Type | cellular component |
| Description | The ring-like, filamentous structure located at the distal end of the midpiece of the sperm flagellum; the annulus is thought to form a diffusion barrier between the midpiece and the principal piece and serve as a stabilizing structure for tail rigidity. (Gene Ontology, GO_0097227) |
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2 proteins localized to the sperm annulus cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.
