Figure 4.

Base composition for each position around the polyadenylation [poly(A)] site for dicotyledonous plants, monocotyledonous plants, non-mammal animals, and mammal animals. See Table 3 for the values of the major base frequency peaks and the names of species in each group. Sequence logo (seqlogo) graphs were drawn based on the average base composition among mapped poly(A) sites. Position 31 in these seqlogo graphs is the poly(A) tail starting position (corresponding to position 1 in Figure 5). Position 30 in these seqlogo graphs is the poly(A) tail attachment position (corresponding to position −1 in Figure 5). Positions 13 and 22 in these seqlogo graphs correspond to positions −18 and −9 in Figure 5. Note that i) the locations of the upstream A peak and upstream U peak are identical between dicotyledonous plants and monocotyledonous plants and between non-mammal animals and mammals, and ii) the upstream A abundance peak (position 13 in animals) and U abundance peak (position 22 in animals) are at the same locations between subkingdoms but are two or three bases apart between the plant and animal kingdoms.