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SPE-9 class proteins presumably required for sperm-oocyte interactions. A: SPE-9. E, EGF-like domain. B: SPE-42. The region corresponding to the DC-STAMP domain is indicated by a broken purple line. C: SPE-38. D: SPE-41/TRP-3. In these figures, predicted functions are highlighted by orange letters. Blue cylinders represent the transmembrane domains. PM, plasma membrane.
