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To test the performance of the membrane , we conducted diffusion experiments at the physiological pH of 7 . 4 using bovine serum albumin ( BSA ) and globulin - gamma , two proteins with different diameters but too close in size ( 2 - fold difference in molecular mass ) to be efficiently separated via conventional dialysis membrane processes .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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