(A) Growth curves of wild-type E. coli O157:H7 (squares) and an isogenic mutant of stx2 (circles) in Eagle's minimal essential medium (EMEM) and LB, a medium that is relatively rich in nutrients.

This engineered E. coli strain was able to grow to a relatively high OD600 of 7~11, showing promise as a platform strain growing solely on CO 2 and formic acid. Professor Lee said, "We engineered E.