Vegan substitute for gelatin (4)

I believe the answer is:

agar

(Other definitions for agar that I've seen before include "Jelly used in bacteria culture" , "Seaweed derivative" , "contribution to culture?" , "Seaweed jelly" , "Jelly got from seaweeds, used in foods" .)

I've seen this clue in the Newsday.com and The New York Times.

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