B. cenocepacia is an opportunistic pathogen that can cause lung infections in cystic fibrosis patients. While previous research has predominantly focussed on larger proteins, evidence is accumulating that polypeptides (< 200 amino acids) are involved in various biological processes. The goal of the present study is to elucidate involvement of mini-proteins and toxin antitoxin-modules in B.cenocepacia biofilm formation and persistence.