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A mutation in Escherichia coli to resistance to the aminoglycoside antibiotic kasugamycin alters the 30S ribosomal subunit. Though all other known 30S ribosomal mutations are located in a cluster in the streptomycin region, kasugamycin resistance is located at a distance from this region, near the leucine region.
P. Frederick Sparling (Fri,) studied this question.