PCR with bla
specific primers on total DNA extracted from polar bear faeces. Lane 1 and 14, 1 kb Plus DNA ladder (Invitrogen, California, USA); lane 2, bear no. 6; lanes 3-7, five parallel DNA extraction from faeces from bear no 7; lane 8, bear no. 8; lane 9-13 positive controls (TEM-3, TEM-6, TEM-9, TEM-10, SHV-2).