- Proteins encoded by open reading frames 3 and 4 of the genome of Lelystad virus (Arteriviridae) are structural proteins of the virion. van Nieuwstadt, A.P., Meulenberg, J.J., van Essen-Zanbergen, A., Petersen-den Besten, A., Bende, R.J., Moormann, R.J., Wensvoort, G. J. Virol. (1996)









