Hybridization of Y. enterocolitica chromosomal DNA digested with EcoRI/HindIII with a probe containing the sat gene from Y. enterocolitica Y56. Lanes: 1, P1403; 2, P219; 3, WA; 4, 13514; 5, My79b; 6, IP97; 7, IP4124; 8, IP22273; 9, IP22274; 10, H-6; 11, H-14; 12, Y-56; 13, Y-60; 14, E. coli chromosomal DNA; 15, molecular mass markers. The sizes of the markers in kilobases are shown on the right.