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SEM of H. pylori strain 26695 (A and B) and its isogenic amiA mutant (C and D) grown without amoxicillin (A and C) and after 3–4 h exposure to 10 μg/ml amoxicillin (B and D). Amoxicillin treatment of the amiA mutant bypasses the requirement of amiA for the morphological transition, indicating that absence of coccoid forms was not due to sterical hindrance of the bacterial chains.
