Fig. 2
From: Antibiotic resistance: it’s bad, but why isn’t it worse?
Gentamicin resistance, an example of genetic and biochemical diversity. Resistance to gentamicin occurs in a variety of ways. Altered membrane potential, efflux, and 16S rRNA methylation all confer resistance but leave the antibiotic unaltered. Various group-transfer reactions add phosphoryl, nucleotidyl, or acetyl groups at several positions on the molecule