Septin-4 (SEPTIN4)

Filament-forming cytoskeletal GTPase (By similarity). May play a role in cytokinesis (Potential).

Forms a filamentous arrangement with SEPT12, SEPT6, SEPT2 and probably SEPT4 at the sperm annulus that's needed for the structural integrity and motility of the sperm tail through postmeiotic differentiation (PubMed:25588830). May play a role in platelet secretion.