Fig. 1From: The diversity of hydrogen-producing bacteria and methanogens within an in situ coal seamThe Venn diagram showing the number of shared and unique OTUs between different Groups for bacterial community (a) and archaea community (b). Group 1: C1, C7; Group 2: C2, C3, C6, C10; Group 3: C4, C9; Group 4: C5, C8Back to article page