Weird vine fruit

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I was at my sister-in-law's house in Los Angeles when I spotted this fruit growing on a vine on a fence. It was the only fruit I could find. Anyone know what it is? I've never seen anything like it.

UPDATE: I think its a Jasmine (Stephanotis) fruit. Windell and Lenore (our Evil Mad Scientist friends) dissected one.

Mark Frauenfelder

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