Molecular weight determination of the bacteriocin produced by strain UVA1. (a) Coomassie stained SDS-PAGE gel. (b) SDS gel overlaid with the indicator strain Listeria ivanovii HPB28. Std: polypeptide molecular weight standard in kDa, F3c: active FPLC-fraction 10-fold concentrated. CFSc: cell-free supernatant of a UVA1 culture, 10-fold concentrated. CFS: cell-free supernatant not concentrated.