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DGGE analysis of PCR-amplified nifH gene fragments from P. azotofixans and P. durum strains: parallel DGGE separation patterns of gene fragments obtained with genomic DNA from strains DSMZ 1735 (lane 1), BE1 (lane 2), SD20 (lane 3), SD17 (lane 4), RCPG7 (lane 5), F102 (lane 6), 2RC1 (lane 7), C3L4 (lane 8), RBN4 (lane 9), P3E20 (lane 10), and ATCC 35681 (lane 11).
