Figure 3. Azocasein digestion by extracts of crop, style sac and coiled gut contents.

SDS-15% polyacrylamide gel electrophoresis showing the digestion products of azocasein. MW: molecular weight markers. Azocasein substrate (62.5 µg) was loaded in lane 1. Extracts of the different regions of the digestive tract (5 µg proteins) were loaded in lanes 3, 5 and 7. The reaction mixture initially containing 62.5 µg of azocasein and 5 µg of protein in each extract were loaded in lanes 2, 4 and 6.