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Autoradiogram of a Southern blot of RISA profile from soil DNA, hybridized at 58°C with RISA probe 1 (A) and at 53°C with RISA probe 2 (B). Lanes 1, RISA profile of DNA extracted from soil before adding Hg(II); lanes 2, RISA profile of DNA extracted from soil 30 days after adding Hg(II).
