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Preheat oven to 325F; grease a 10-inch tube pan (angel food cake pan)& set aside.
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In a small bowl, combine sour cream& baking soda- stir well& set aside.
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In another bowl, cream sugar& margarine; add egg substitute.
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Combine flour& salt, and add to creamed mixture alternately with sour cream mixture, beginning& ending with flour mixture.
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Stir in vanilla.
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Spoon batter into prepared pan.
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Bake 1 hour+ 35 minutes, or until cake tests done with toothpick.
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Cool cake in the pan 10 minutes; remove& cool completely on wire rack.