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Category:GO:0097227 ! sperm annulus
name: sperm annulus
namespace: cellular_component
def: "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." [GOC:cjm, MP:0009834]
is_a: GO:0110165 ! cellular anatomical structure
relationship: part_of: GO:0036126 ! sperm flagellum
AmiGO
<GOterm>GO:0097227</GOterm>
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