Probably a connector protein for RcsB/C regulation of biofilm formation, providing additional signal input into the two-component signaling pathway. May serve to stimulate biofilm maturation, probably via the Rcs phosphorelay. Mild overexpression at 16 degrees Celsius increases the production of colanic acid, an exopolysaccharide and matrix component, and reduces adhesive curli fimbriae expression. Both of these effects require RcsB. Induced by 5-fluorouracil. Strongly induced at 16 degrees Celsius. Expression is dependent on RpoS, repressed by YcgE. At 16 degrees Celsius with blue light irradiation, expression of this operon is absolutely dependent on YcgF for relief from YcgE repression. Part of the ycgZ-ymgA-ariR-ymgC operon.