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Presence of (A) tdc, (B) odc, (C) hdc, and (D) pdc genes in LAB strains. Lanes: 1, kb ladder (Bioron); 2, positive control (Lactobacillus brevis CECT 5354 for the tdc and pdc genes, L. rhamnosus CECT 288 for the odc gene and L. helveticus CECT 403 for the hdc gene); 3, UVI-14; 4, UVI-20; 5, UVI-5; 6, UVI-17; 7, UVI-18; 8, UVI-21; 9, UVI-23; 10, UVI-2.
