Fig. 4

The FP distribution of the intronic variants. a The FP distribution of the raw intronic variants. The FP of the +2 and −2 positions was higher than the +1 and −1 positions. Then it was slowly gradually decrease until to +26 and −26 positions it transformed to gradually raise. After the +50 and −50 positions, it increased significantly until to +192 and −192 positions it tended to be stable. b The fill FP distribution of the raw intronic variants. The FP distribution rule of the raw intronic variants revealed from this picture was the same as that in figure a. c. The distribution of average depth at different positions in intronic regions flanking exons which was inversely proportional to the FP distribution