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Friday, June 14, 2002 10:28 AM 12321 blac_molecule.jpg
Friday, June 14, 2002 10:28 AM 158027 gram_negative.jpg
Friday, June 14, 2002 10:28 AM 164085 gram_positive.jpg
Friday, June 14, 2002 10:28 AM 49641 plasmid 1.jpg
Friday, June 14, 2002 10:28 AM 49209 plasmid.jpg