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Gram stain test. glass Petri dish with culture Gram-negative bacteria Escherichia coli after used of crystal violet stain. Close-up of Gram-positive bacteria Clostridium perfringens. Vector illustration

Gram stain test. glass Petri dish with culture Gram-negative bacteria Escherichia coli after used of crystal violet stain. Close-up of Gram-positive bacteria Clostridium perfringens. Vector illustration

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