SELENOK and selenium deficiency: Table 4 also illustrates expression of SelenoF, SelenoK, SelenoS, SelenoM and SelenoT, selenoproteins that have not previously been implicated in disease processes or pregnancy abnormalities. Maternal selenium deficiency did not have any significant impact on expression of any of these selenoproteins in the placenta at E18.5. Placental expression of selenoproteins that have been implicated in disease were also investigated. Gene expression of SelenoN (Ptrt < 0.001) and SelenoP (Ptrt < 0.05) were significantly reduced regardless of foetal sex.