DGGE pattern of 16S rRNA gene sequences during litter decomposition in soil in central Germany. Lanes 1, 7, 14, and 17, marker; lane 2, negative control; lanes 3 to 13, five decomposition stages for rye grass on days 0, 18, 58, 118, and 180 (R0, R18, R58, R118, and R180, respectively) (duplicate samples); lanes 15 and 16, wheat straw on day 0 (W0).