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Representative pictures of biofilm formation in glass tubes by [P.] pneumotropica biotype Jawetz (A.), [P.] pneumotropica biotype Heyl (B.) and [A.] muris (C.) after 24 h incubation at 37°C and staining with crystal violet. The strain number is pasted on the corresponding tube. The picture of a tube containing sterile BHI was included in panel A for comparison purposes.
