Figure 4. Sequences alignment of PAL3 and its homologs The black background represent that all amino acid sequences are homologous. The gray part represent that some of the amino acid sequences are homologous. The white part represent that the amino acid sequences are completely different. * indicate the mutation sites of the pal3-1, pal3-2 and pal3-4 mutants in turn; △: The variation sites between Hap1 and Hap3.