Optimization of HLA-B*27 ALLELE Genotyping by PCR-SSP Fernanda Formaggi Lara-Armi; Jeane Eliete Laguila Visentainer; Hugo Vicentin Alves; Marco Antônio Rocha-Loures; Janisleya Silva Ferreira Neves; Cristiane Maria Colli; Quirino Alves de Lima; Ricardo Alberto Moliterno; Ana Maria Sell;