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Fig. 4. Western blot analysis of mucus CA from guinea pig. Mucus from guinea pig caecum was applied at an activity amount of 0.87 U ml-1. Positive controls are (*) isolated guinea pig CA II at 5.1x10-3 U ml-1 CA activity and ({dagger}) isolated CA II at 0.79 U ml-1. Applying isolated mucus CA from the guinea pig at an activity amount of 5.3x10-3 U ml-1 did not result in a visible band.