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The phylogenetic tree was constructed based on the protein sequences of AiPC4s and PC4s from other species. Numbers at the tree nodes indicate the bootstrap values from 1500 replicates. AiPC4s and PC4s from C. farreri and P. yessoensis are represented by red, black and blue circles, respectively. Accession numbers of other species’ PC4s are listed in the Table S1.
