Domain organization of the PABP gene family in Arabidopsis thaliana . Each RNA recognition motif (RRM) is indicated in green and the PABC domain is indicated in blue. The position of each intron is indicated by vertical white bars. The RNP1 and RNP2 motifs within each RRM are indicated as lines above each domain. Protein sequences used were: PAB1 (At1g34140), PAB2 (At4g34110), PAB3 (At1g22760), PAB4 (At2g23350), PAB5 (At1g71770), PAB6 (At3g16380), PAB7 (At2g36660), and PAB8 (At1g49760).