Effect of recombinant IbpA on the aggregation of insulin in vitro. Proteins' preps were used in the following concentrations: insulin and egg albumin (both Sigma, USA)—0.5 mg/ml, IbpA—0.1 and 0.45 mg/ml. Experiments were performed at 25°C (a, c, e) or 43°C (b, d, f)