On the stability of dispensable constituents of the eukaryotic genome: stability of coding sequences versus truly hypervariable sequences in a clonal vertebrate, the amazon molly, Poecilia formosa.
Schartl M, Schlupp I, Schartl A, Meyer MK, Nanda I, Schmid M, Epplen JT, Parzefall J. Proc Natl Acad Sci U S A. 1991 Oct 1; 88(19):8759-63.