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Restriction enzyme digestions of PCR products amplified from P. infestans with primer pairs F1-R1 (cut with CfoI), F2-R2 (cut with MspI), F3-R3 (cut with EcoRI), and F4-R4 (cut with EcoRI). Amplifications were conducted with DNA from four isolates representing each of the four Carter (4) mitochondrial DNA haplotypes, namely Ia, 96.70; Ib, K1067; IIa, E14c2; and IIb, Ca65. Lanes marked M contain 100-bp ladders (Gibco BRL Ltd.).
