0
10
20
2.5
5.0
7.5
10.0
Resolution (Å)
Number of PDB entries
Histone species
Xenopus laevis
Mus musculus
Homo sapiens
Saccharomyces cerevisiae S288C
Drosophila melanogaster
Arabidopsis thaliana
Leishmania major
Resolution of nucleosome crystal structures by histone species