The researchers also found that all Cit + clones had duplication mutations of a 2933 base pair segment that were involved in the gene for the citrate transporter protein used in anaerobic growth on citrate, "citT".
The researchers also found that all Cit + clones had mutations in which 2933 base pair segment of DNA was duplicated or amplified. The duplicated segment contained the gene for the citrate transporter protein used in anaerobic growth on citrate, "citT".