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The predicted gene structure and phylogenetic relationships of the StPIN family of genes. (A) The direction of transcription is from left to right. Black boxes represent the exons, white boxes represent the 5' and 3' UTR and the lines represent the introns. (B) Phylogenetic tree of the PIN proteins of A. thaliana and S. tuberosum. Accession numbers of the A. thaliana sequences are given in Table S4.
