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SEM photographs of agarose microspheres manufactured by 2nd crosslinking with a reaction time of 4 h using (A) Biowest agarose, (B) Lonza agarose, (C) Promega agarose and by (D) 1st crosslinking with a reaction time of 24 h and (E) 2nd crosslinking with a reaction time of 24 h using Lonza agarose (40 000 ×)
