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Idiogram showing the chromosomal location of 5S rDNA, 18S rDNA, H3 histone genes and constitutive heterochromatin distribution pattern in the four Romaleidae grasshoppers. The black, chromosome regions represent the constitutive heterochromatin [22,30] and the blue, red and green areas represent the 5S rDNA, 18S rDNA and the H3 histone genes, respectively.
