Chromosomal distribution and segmental duplication events of genes encoding histone chaperones in Arabidopsis and rice. The karyograms show the chromosomal positions of genes coding for histone chaperones belonging to NAP, CAF1, SPT6, SPT16, SSRP, HIRA, ASF and NASP families/sub-families from (A) Arabidopsis and (B) rice showing genes located on chromosome 1 to 6, and (C) rice showing genes on chromosome 7 to 12. The broken lines connect genes located on duplicated segments of chromosomes with the color of the line representing the color of the histone chaperone family. The chromosomal positions of each of the genes are shown by colored horizontal bars and the orientation of the respective genes has been shown by arrows. Scale is shown at the left (Mb indicates mega base pairs) and the centromeres are represented by oval shapes in gray.