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chemically, agar is a galactan, a complex carbohydrate with galactose molecules which are not metabolized by non-ocean microbes.

*** It has been know that only marine bacteria can degrade agar, but there are some reports that some soil bacteria can degrade and utilize the agar. http://www.jstage.jst.go.jp/article/bbb/67/5/67_1048/_article/-char/en

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