Amplification products obtained from the tuf multiplex assay. Lane M, 50-bp DNA molecular marker (Sigma); lane m, 1-kb DNA ladder (Gibco BRL). Lane 1, L. casei NCC 2508; lane 2, L. paracasei subsp. paracasei NCC 989; lane 3, L. rhamnosus NCC 2504; lane 4, L. paracasei subsp. paracasei NCC 2461; lane 5, L. rhamnosus ATCC 11443; lane 6, L. reuteri DSM 2006; lane 7, L. fermentum ATCC 14931; lane 8, L. casei NCC 617; lane 9, L. paracasei subsp. paracasei NCC 438; lane 10, L. paracasei subsp. paracasei NCC 476; lane 11, L. paracasei subsp. paracasei NCC 400; lane 12, L. rhamnosus NCC 596; lane 13, L. rhamnosus NCC 587; lane 14, L. rhamnosus NCC 546; lane 15, L. rhamnosus NCC 2488; lane 16, L. rhamnosus NCC 2455; lane 17, L. paracasei subsp. paracasei NCC 1002; lane 18, L. paracasei subsp. paracasei NCC 2548; lane 19, L. paracasei subsp. paracasei NCC 2556; lane 20, L. paracasei subsp. paracasei NCC 171; lane 21, negative control.