sentence: Although at 2.2 mg / ml and 4.4 mg / ml the survival of planktonic bacteria was 44 ± 2 % and 16 ± 2 % , respectively , the ability of the bacteria to form a biofilm was only 14 ± 3 % for 2.2 mg / ml and 3 ± 1 % for 4.4 mg / ml EGCG in comparison to control bacteria , suggesting a specific anti-biofilm effect of EGCG in addition to its anti-bacterial activity.Our assumption was that the reduced production of EPS by EGCG could be due to a down-regulation of genes responsible for EPS production , such as gtfB , gtfC and ftf .