2-DE gel images of TC and OM-enriched protein fractions of A. baumannii ATCC 19606T. Panels A, B, C, and D represent TC fractions obtained from cells grown under −Fe/−DIP, +Fe/−DIP, −Fe/+DIP or +Fe/+DIP conditions, respectively. Panels E, F, G, and H represent OM fractions obtained from cells grown under −Fe/−DIP, +Fe/−DIP, −Fe/+DIP or +Fe/+DIP conditions, respectively. Mr, relative molecular weight; pI, isoelectric point.