1. Department of Microbiology and Parasitology, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte 59078‑970, Brazil
2. Department of Biomedical Sciences, Rio Grande do Norte State University, Mossoró, Rio Grande do Norte 59607‑360, Brazil
3. Laboratory of Applied Molecular Biology, Department of Biochemistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte 59078‑970, Brazil