Figure 2.

Nuclear-encoded proteins that promote chloroplast intron splicing in Arabidopsis (a) and other land plants (b). Most of the splicing factors that have been diagrammed in previous reviews (see de Longevialle et al., 2010; Stern et al., 2010; Khrouchtchova et al., 2012; Germain et al., 2013) are not shown in this figure. The chloroplast introns are classified into group I, IIA, and IIB. The oval represents PPR proteins, the quadrilateral represents CRM domain proteins, and the hexagon represents other domain proteins. The asterisk refers to introns present in Arabidopsis but absent in rice and maize.