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Response of a population of three R. sphaeroides mutants to a 30-s pulse of blue light. ▴, light on; ▾, light off. JPA 203 (A) contains a Tn5 insertion in cheAII (Δoperon 1, cheWII), JPA 211 (B) has cheAII deleted in frame, and JPA 215 (C) has both operon 1 and cheAII deleted in frame.
