Molecular Approaches to Improve the Insecticidal Activity of Bacillus thuringiensis Cry Toxins oleh Wagner A. Lucena, Patrícia B. Pelegrini, Diogo Martins-de-Sa, Fernando C. A. Fonseca, Jose E. Gomes, Leonardo L. P. de Macedo, Maria Cristina M. da Silva, Raquel S. Oliveira, Maria F. Grossi-de-Sa