Gram-Positive Bacteria | Soil-dwelling Streptomyces are a source of many antibiotics, including streptomycin used to treat tuberculosis, which is caused by another gram-positive bacterium, Mycobacterium tuberculosis | Mycoplasmas are tiny and have no cell walls. One species causes "walking pneumonia". Hundreds of mycoplasmas are seen here covering a human fibroblast cell. |
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