Protein sequence alignment of the three variants of histone H3 in soybean. The cetromere specific histone H3 (centro. H3) was very different from the other two histone variants H3.1 and H3.2, while H3.1 and H3.2 were different from each other in only 4 amino acids, A31F41S87S90 in H3.1 and T31Y41H87L90 in H3.2, which were indicated by red triangle in the figure. Sequences were downloaded from soybean genome database http://www.phytozome.net/soybean. Accession numbers were as follows: Glyma11g37960.1 for histone H3.2; Glyma11g13940.1 for histone H3.1; Glyma07g06310.1 for centro.H3.