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Physical mapping of repetitive DNA. The codes PEX and PUN refer to the karyotypes of P. expansa and P. unifilis, respectively. The 5S rDNA (green) is detected in a single chromosomal pair (pair 13) in (A) PEX and (B) PUN. Mapping of the U2 snRNA (red) also yields signals on chromosome pair 13 for (C) PEX and (D) PUN. The transposon, Tc1/Mariner (green), is widely distributed along the karyotypes of (E) PEX and (F) PUN.
