The platypus epididymal proteome is being studied because epididymal proteins are essential for male fertility in mammals and it is considered that knowledge of the epididymal proteome in an early mammal would be informative in assessing the convergence and divergence of proteins that are important in the function of the mammalian epididymis. Few of the epididymal proteins that have been identified in eutherian mammals were found in platypus caudal epididymal fluid, and the major epididymal proteins in the platypus (PXN-FBPL, SPARC and E-OR20) have never been identified in the epididymis of any other mammal.
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Dacheux, J., Dacheux, F., Labas, V., Ecroyd, H., Nixon, B. & Jones, R. C. (2009). New proteins identified in epididymal fluid from the platypus (Ornithorhynchus anatinus). Reproduction, Fertility and Development, 21 (8), 1002-1007.