parasite schistosoma mansoni’ infects humans by penetrating the skin. the larva secretes enzymes that catalyze the cleavage of paptide bonds between…

parasite schistosoma mansoni’ infects humans by penetrating the skin. the larva secretes enzymes that catalyze the cleavage of paptide bonds between residues x and y in the sequence Gly-Pro-X-Y-. Why is this enzyme activity is important in this parasite?