Figure 1.

Analysis of AP introns. (A) Schematic of the intron location and boundary sequences in kmiap and pmnap, the characters marked at the boundary of the intron represent donor site (left) and acceptor site (right), and the numbers with arrows indicate the nucleotide position of intron from the start codon. (B) Sequence comparison of six different variants of intron in pmnap, and the length for each intron variant was marked at the right.