@article{marcondes_hansen_2008,  title={Transgenic lettuce seedlings carrying hepatitis B virus antigen HBsAg},  volume={12},  ISSN={1413-8670},  url={https://doi.org/10.1590/S1413-86702008000600004},  DOI={10.1590/S1413-86702008000600004},  number={6},  journal={Brazilian Journal of Infectious Diseases},  publisher={Brazilian Society of Infectious Diseases},  author={Marcondes, Jackson and Hansen, Ekkehard},  year={2008},  month={Dec},  pages={469–471} }