Plasmid profile analysis of TEM-24b-producing (A) and TEM-21-producing (B) members of the family Enterobacteriaceae. EcoRI restriction plasmid patterns were obtained from transconjugants or transformants. Lane 1, E. coli strain of molecular type Ec1 (profile A-1); lane 2, K. pneumoniae strain of molecular type Kp1 (profile A-2); lanes 3 and 4, K. pneumoniae strain of molecular type Kp2 (profiles A-3); lane 5, S. marcescens (profile A-4); lane 6, M. morganii (profile A-2); lane 7, P. stuartii (profile A-1); lanes 8 to 13, TEM-24-producing E. aerogenes strain of molecular type Ea1 divided into profile A-1 (lanes 8 to 10), profile A-2 (lane 11), profile A-4 (lane 12), and profile A-5 (lane 13); lanes 14 to 22, TEM-21-producing strains with the B profile. Lanes M, molecular weight marker (lambda phage DNA digested with PstI).