@article{mckerrow_1989,  title={Molecular and biochemical studies of the cercarial proteinase of Schistosoma mansoni},  volume={84},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02761989000500021},  DOI={10.1590/S0074-02761989000500021},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={McKerrow, James H.},  year={1989},  pages={209–210} }