Expression pattern of histone chaperones in Arabidopsis and rice during development. Heat maps show microarray-based expression profile of histone chaperones from Arabidopsis (A) and rice (B) at various developmental stages indicated at the top of each of the map. ‘Milk’ and ‘Dough’ represent stages of seed development in rice. Hierarchical clustering using weighted average linkage method and Euclidean distance metric was used to generate the heat maps. Color bars at the bottom of each of the heat maps show the corresponding scale for log2 expression, with green representing lowest expression and red representing the highest. Roman numerals followed by uppercase letters represent position of some major clusters as referred to in the text. ‘h’ represents a specific sub-cluster as part of the cluster IIB.