Exon-intron pattern observed in Populus and fungi XIPs. Exon-intron organization of XIP MIP genes from Populus and fungi is displayed. Five out of 6 PtXIPs have similar exon-intron organization and the pattern is shown in gray background. The sixth PtXIP (PtXIP2;1) has no introns and its gene structure is shown separately. The six TM regions are shown in black bars and the loops B and E are shown in oval shape. The intron positions are indicated by inverted triangle. For details about fungi XIPs, see Table 3.