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Methanol release from wild-type and mutant strains upon the addition and removal of 1 mM propionate (shown by arrows). (a) WS8N (wild-type) showed release upon the addition of attractant. (b) ΔcheR1 (JPA568) showed release upon attractant removal as well as upon addition. (c) Δche Op1 showed a wild-type methanol release profile. (d and e) Methanol release was not detected in ΔcheR2 (JPA565) (d) or in ΔcheB1 (JPA517) (e).
