Figure 2
From: Comprehensive analysis of CCCH zinc finger family in poplar (Populus trichocarpa)
Phylogenetic trees of full-length CCCH domain proteins from Populus, Arabidopsis and rice. All CCCH proteins of Populus (91), Arabidopsis (68) and rice (67) were divided into five distinct subfamilies (CCCH-a to CCCH-e) based on the types of CCCH motif. Each protein in subfamily CCCH-a has 1–3 C-X7-C-X5-C-X3-H motif (s), CCCH-b has 1–6 C-X8-C-X5-C-X3-H, CCCH-c has 2–3 C-X7-C-X5-C-X3-H and C-X8-C-X5-C-X3-H, CCCH-d has 1 C-X5-C-X4-C-X3-H and 1 C-X7,8,10-C-X5-C-X3-H, whereas CCCH-e has 1–6 other non-conventional CCCH motifs. The unrooted tree was constructed based on the full-length protein sequences using MEGA 4.0. Numbers at nodes indicate the percentage bootstrap scores and only bootstrap values higher than 50 % from 1,000 replicates are shown. The percentages in the bracket represent protein sequence similarity range for each subfamily, which were obtained using the Smith-Waterman algorithm. Populus CCCH proteins were marked with the red dots. The scale bar corresponds to 0.05 or 0.1 estimated amino acid substitutions per site.