Statistics on the CCCH proteins from Populus (Pt), Arabidopsis (At) and rice (Os). A. Numbers of the CCCH proteins. The number in overlapping zone represents number of homologous genes between three species. B. Numbers of CCCH proteins with 1, 2, 3, 4, 5 or 6 CCCH motifs. C. Numbers of CCCH motifs for each CCCH motif class.