Comparative analysis of the location of homologous sequences inArabidopsis and rice. (a) Rice ESTs with putative homology to Arabidopsis genes from 10 BAC clones organized in five contigs, and their chromosomal location and copy number in rice. Copy numbers were estimated from the number of hybridizing fragments. Probes detecting a strong hybridizing fragment in addition to weak fragments were assigned a copy number of 1. Boxed locations indicate that the rice ESTs displayed homology at both 5′ and 3′ ends with the BAC sequence. Shaded boxes indicate that homology of loci was established based on cross-hybridization data. Genetic distances are shown but not drawn to scale. Contig numbers are indicated in parenthesis. (b) Map position in rice for the identified rice ESTs. The contig number is given in parenthesis. Centimorgan distances between the loci are in italics. (○) Centromeres.