Fig. 4

Alternative splicing of the plant BPA genes. a Alternative splicing events identified in land plant BPAs. Alternative splicing events were mapped onto the BPA phylogenetic tree and labeled with their pattern numbers. ①, lacking peptide in the non-domain region; ②, having supplementary peptide in the non-domain region; ③, lacking peptide in the domain region; ④, having supplementary peptide in the domain region; ⑤, lacking domain region. b Summary of alternative splicing events in selected species. c Alternative splicing patterns detected in this study