- Linkage group V of platyfishes and Swordtails of the genus Xiphophorus (Poeciliidae): linkage of loci for malate dehydrogenase-2 and esterase-1 and esterase-4 with a gene controlling the severity of hybrid melanomas. Morizot, D.C., Siciliano, M.J. J. Natl. Cancer Inst. (1983)