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Metaphase I of Triatoma vitticeps stained by C-banding. Note the karyotype 2n = 24 (20A + X1X2X3Y) and heterochromatin restricted to only one of the X sex chromosomes and in the Y sex chromosome. X = X sex chromosome; Y = Y sex chromosome. Bar: 10 μm. This figure appears in color at www.ajtmh.org.
