Fig. 10From: Petroleum hydrocarbon rich oil refinery sludge of North-East India harbours anaerobic, fermentative, sulfate-reducing, syntrophic and methanogenic microbial populationsPhylogenetic tree of functional genes mcrA (a) dsrB (b) based on translated partial amino acid sequences. Trees were constructed using neighbor joining method and bootstrap values > 50% were indicated at the nodes. One thousand bootstrap analyses were conducted. Scale bar = 0.05 change per amino acid positionBack to article page